diff --git a/regress/floating-pane-prompt-wide-character.sh b/regress/floating-pane-prompt-wide-character.sh
new file mode 100755
index 000000000..cdd892a54
--- /dev/null
+++ b/regress/floating-pane-prompt-wide-character.sh
@@ -0,0 +1,179 @@
+#!/bin/sh
+
+# A damage rectangle's clip range is grown to avoid splitting a wide
+# character, but redraw_damage_grow_span_clip() (screen-redraw.c) only ever
+# checks the span's own pane *content* grid (wp->screen) for that. For a
+# REDRAW_SPAN_PANE span, that same range is then also handed to
+# redraw_damage_draw_pane_prompt() to recompose the pane's separately
+# rendered prompt (wp->prompt, e.g. from "command-prompt -P") over the
+# damaged sub-range - but the prompt is drawn into its own, freshly
+# allocated one-line screen, unrelated to the pane's content grid, so a
+# range grown (or left ungrown) against the content is not necessarily
+# grown correctly for the prompt's own wide characters.
+#
+# This is invisible when the pane's own content is plain ASCII (as here):
+# redraw_damage_grow_span_clip() never finds anything to grow against, so
+# the raw, ungrown geometric range is passed straight through to the
+# prompt - and if that range's edge lands mid-character in the *prompt's*
+# grid, tty_draw_line() clears the character it cuts through
+# (tty_draw_line_get_empty()'s gc->data.width > nx check, for a trailing
+# base cell with no room left for its padding half).
+#
+# The trigger is a palette change (OSC 4) in a tiled pane that is one half
+# of a vertical split running the full height of the window - occluded
+# under the floating pane, but still geometrically triggering a redraw of
+# its own rectangle. Positioned so the split boundary falls inside the
+# floating pane's own CJK prompt, this reproduces exactly Codex's report:
+# "a floating pane containing a CJK prompt across a tiled-pane boundary -
+# a palette update in the tiled pane blanks a prompt character."
+
+PATH=/bin:/usr/bin
+TERM=screen
+LC_ALL=C.UTF-8
+export PATH TERM LC_ALL
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+
+DIR=$(mktemp -d) || exit 1
+cd "$DIR" || exit 1
+INNER="$TEST_TMUX -Lpromptwide-inner-$$ -f/dev/null"
+OUTER="$TEST_TMUX -Lpromptwide-outer-$$ -f/dev/null"
+EMITTER=$DIR/emitter.pl
+CAPTURE=$DIR/capture
+FLOAT=
+
+fail()
+{
+	echo "$*" >&2
+	[ -s "$CAPTURE" ] && cat "$CAPTURE" >&2
+	exit 1
+}
+
+cleanup()
+{
+	$OUTER kill-server 2>/dev/null
+	$INNER kill-server 2>/dev/null
+	cd /
+	rm -rf "$DIR"
+}
+trap cleanup 0 1 15
+
+wait_for_client()
+{
+	i=0
+	while [ "$i" -lt 50 ]; do
+		CLIENT=$($INNER list-clients -F '#{client_name}' 2>/dev/null)
+		[ -n "$CLIENT" ] && return 0
+		sleep 0.1
+		i=$((i + 1))
+	done
+	fail "inner client did not attach"
+}
+
+wait_outer_has()
+{
+	marker=$1
+	i=0
+	while [ "$i" -lt 50 ]; do
+		$OUTER capture-pane -p -t outer:0.0 >"$CAPTURE" 2>/dev/null || true
+		grep -q "$marker" "$CAPTURE" && return 0
+		sleep 0.1
+		i=$((i + 1))
+	done
+	fail "outer client did not show $marker"
+}
+
+wait_prompt_row_intact()
+{
+	i=0
+	while [ "$i" -lt 50 ]; do
+		$OUTER capture-pane -p -t outer:0.0 >"$CAPTURE" 2>/dev/null || true
+		line=$(sed -n "${PROMPTROW}p" "$CAPTURE")
+		case $line in
+		*"$PROMPTTEXT"*) return 0 ;;
+		esac
+		sleep 0.1
+		i=$((i + 1))
+	done
+	fail "the CJK prompt was not intact after the palette-triggered damage - got: $line"
+}
+
+cat >"$EMITTER" <<'PERL'
+use strict;
+use warnings;
+
+$| = 1;
+my $line = <STDIN>;
+print "\e]4;1;rgb:11/22/33\e\\";
+sleep 100;
+PERL
+
+$INNER new-session -d -s inner -x 60 -y 12 "perl '$EMITTER'" || exit 1
+$INNER set-option -g status off || exit 1
+$INNER set-option -g window-size manual || exit 1
+LEFT=$($INNER list-panes -t inner -F '#{pane_id}') || exit 1
+
+# Split so the boundary between the two tiled panes falls at column 17 -
+# used below to pick a floating-pane column that lands the boundary
+# mid-character inside the prompt.
+RIGHT=$($INNER split-window -t inner -h -l 43 -PF '#{pane_id}' \
+    'sleep 100') || exit 1
+RX=$($INNER display-message -p -t "$RIGHT" '#{pane_left}') || exit 1
+
+# Create the floating pane, then check its actual resulting position (the
+# border-framing offset added to -X is not something to hand-compute). Try
+# adjacent starting columns until the split boundary lands on an odd
+# (padding-half) column of the prompt's own numbering, and within the
+# prompt's 12-column width.
+startx=10
+tries=0
+while [ "$tries" -lt 4 ]; do
+	[ -n "$FLOAT" ] && $INNER kill-pane -t "$FLOAT" 2>/dev/null
+	FLOAT=$($INNER new-pane -d -PF '#{pane_id}' -x 24 -y 5 -X "$startx" \
+	    -Y 2 "sh -c 'i=0; while [ \$i -lt 10 ]; do \
+printf AAAAAAAAAAAAAAAAAAAAAA\\\\n; i=\$((i+1)); done; sleep 100'") ||
+	    exit 1
+	sleep 0.2
+	X1=$($INNER display-message -p -t "$FLOAT" '#{pane_left}')
+	Y1=$($INNER display-message -p -t "$FLOAT" '#{pane_top}')
+	H1=$($INNER display-message -p -t "$FLOAT" '#{pane_height}')
+	local=$((RX - X1 - 1))
+	if [ "$local" -ge 1 ] && [ "$local" -le 11 ] &&
+	    [ $((local % 2)) -eq 1 ]; then
+		break
+	fi
+	startx=$((startx + 1))
+	tries=$((tries + 1))
+done
+local=$((RX - X1 - 1))
+[ "$local" -ge 1 ] && [ "$local" -le 11 ] && [ $((local % 2)) -eq 1 ] ||
+	fail "could not find bad-parity starting column"
+
+$OUTER new-session -d -s outer -x 60 -y 12 'sleep 100' || exit 1
+$OUTER set-option -g status off || exit 1
+$OUTER set-option -g window-size manual || exit 1
+$OUTER set-option -g default-terminal screen-256color || exit 1
+$OUTER respawn-pane -k -t outer:0.0 \
+    "$TEST_TMUX -Lpromptwide-inner-$$ -f/dev/null attach-session -t inner" ||
+    exit 1
+
+wait_for_client
+wait_outer_has AAAAAAAAAAAAAAAAAAAAAA
+CLIENT=$($INNER list-clients -F '#{client_name}') || exit 1
+
+$INNER select-pane -t "$FLOAT" || exit 1
+PROMPTTEXT=$(printf '\344\270\255' | perl -CSD -ne 'print $_ x 6')
+$INNER command-prompt -b -P -t "$CLIENT" -p "$PROMPTTEXT" \
+    'display-message -- %1' || exit 1
+wait_outer_has "$PROMPTTEXT"
+
+PROMPTROW=$((Y1 + H1))
+
+# Trigger the damage: unblock the emitter so it fires the palette change in
+# the left tiled pane, which is occluded under (but geometrically overlaps)
+# the floating pane's prompt row.
+$INNER send-keys -t "$LEFT" Enter || exit 1
+
+wait_prompt_row_intact
+
+exit 0
diff --git a/regress/floating-pane-status-cross-client.sh b/regress/floating-pane-status-cross-client.sh
new file mode 100755
index 000000000..ee3f19259
--- /dev/null
+++ b/regress/floating-pane-status-cross-client.sh
@@ -0,0 +1,117 @@
+#!/bin/sh
+
+# redraw_damage_refresh_status() (screen-redraw.c) force-regenerates a
+# pane's border-status title when a damage rectangle touches it, guarded
+# by the per-pane PANE_NEWSTATUS flag. window_make_pane_status() formats
+# pane-border-format using the requesting client's own context (so e.g.
+# #{client_name} differs per client), but wp->status_screen/PANE_NEWSTATUS
+# are shared by every client viewing the pane. With two clients attached
+# to the same session, whichever client's damage pass runs first renders
+# its own text and sets the flag; the other client's damage pass, finding
+# the flag already set, used to skip rendering entirely and reuse
+# whatever was already there.
+#
+# This checks the actual server-side decision via the -vv log rather than
+# a visual capture: an unrelated periodic client status-refresh reliably
+# repaints each client's title correctly again within the same tick right
+# after the buggy decision is made, before anything is ever flushed to
+# either terminal, so the wrong content this bug produces is never
+# visible to any external capture - the log is the only place the actual
+# bug (or its absence) can be observed.
+#
+# A floating pane with its own pane-border-status is positioned so that a
+# damage rectangle from an *unrelated* palette change (OSC 4) in the
+# underlying tiled pane - whose own geometry spans the whole window -
+# overlaps the floating pane's title row without touching its content,
+# giving a damage-only trigger with no side effect that would otherwise
+# force a normal (non-buggy) full per-client status re-render in the same
+# pass and mask the result either way.
+
+PATH=/bin:/usr/bin
+TERM=screen
+LC_ALL=C.UTF-8
+export PATH TERM LC_ALL
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+
+DIR=$(mktemp -d) || exit 1
+cd "$DIR" || exit 1
+INNER="$TEST_TMUX -vv -Lstatuscc-inner-$$ -f/dev/null"
+OUTER1="$TEST_TMUX -Lstatuscc-outer1-$$ -f/dev/null"
+OUTER2="$TEST_TMUX -Lstatuscc-outer2-$$ -f/dev/null"
+
+fail()
+{
+	echo "$*" >&2
+	exit 1
+}
+
+cleanup()
+{
+	$OUTER1 kill-server 2>/dev/null
+	$OUTER2 kill-server 2>/dev/null
+	$INNER kill-server 2>/dev/null
+	cd /
+	rm -rf "$DIR"
+}
+trap cleanup 0 1 15
+
+BASEEMITTER=$DIR/base-emitter.pl
+cat >"$BASEEMITTER" <<'PERL'
+use strict;
+use warnings;
+
+$| = 1;
+my $line = <STDIN>;
+print "\e]4;1;rgb:11/22/33\e\\";
+sleep 100;
+PERL
+
+$INNER new-session -d -s inner -x 40 -y 10 "perl '$BASEEMITTER'" || exit 1
+$INNER set-option -g status off || exit 1
+$INNER set-option -g window-size manual || exit 1
+$INNER set-option -g pane-border-status top || exit 1
+$INNER set-option -g pane-border-format 'C=#{client_name}' || exit 1
+BASE=$($INNER list-panes -t inner -F '#{pane_id}') || exit 1
+FLOAT=$($INNER new-pane -d -PF '#{pane_id}' -x 20 -y 3 -X 5 -Y 4 \
+    'sleep 100') || exit 1
+
+$OUTER1 new-session -d -s outer -x 40 -y 10 'sleep 100' || exit 1
+$OUTER1 set-option -g status off || exit 1
+$OUTER1 set-option -g window-size manual || exit 1
+$OUTER1 set-option -g default-terminal screen-256color || exit 1
+$OUTER1 respawn-pane -k -t outer:0.0 \
+    "$TEST_TMUX -Lstatuscc-inner-$$ -f/dev/null attach-session -t inner" ||
+    exit 1
+sleep 0.5
+NAME1=$($INNER list-clients -F '#{client_name}') || exit 1
+
+$OUTER2 new-session -d -s outer -x 40 -y 10 'sleep 100' || exit 1
+$OUTER2 set-option -g status off || exit 1
+$OUTER2 set-option -g window-size manual || exit 1
+$OUTER2 set-option -g default-terminal screen-256color || exit 1
+$OUTER2 respawn-pane -k -t outer:0.0 \
+    "$TEST_TMUX -Lstatuscc-inner-$$ -f/dev/null attach-session -t inner" ||
+    exit 1
+sleep 0.5
+ALLNAMES=$($INNER list-clients -F '#{client_name}') || exit 1
+NAME2=$(echo "$ALLNAMES" | grep -v "^$NAME1\$")
+[ -n "$NAME2" ] || fail "sanity: could not identify the second client"
+
+# Let any attach-driven full redraw (and its own, non-buggy, per-client
+# status render) finish completely before triggering the damage-only
+# palette update.
+sleep 1.5
+
+$INNER send-keys -t "$BASE" Enter || exit 1
+sleep 0.5
+
+LOG=$(ls tmux-server*.log 2>/dev/null | head -1)
+[ -n "$LOG" ] || fail "sanity: no server -vv log was produced"
+
+n1=$(grep -c "regenerated pane .* status for $NAME1\$" "$LOG")
+n2=$(grep -c "regenerated pane .* status for $NAME2\$" "$LOG")
+[ "$n1" -ge 1 ] || fail "damage pass never regenerated $NAME1's own status - it reused whatever the other client's render left behind"
+[ "$n2" -ge 1 ] || fail "damage pass never regenerated $NAME2's own status - it reused whatever the other client's render left behind"
+
+exit 0
diff --git a/screen-redraw.c b/screen-redraw.c
index 6b920f858..df753aa38 100644
--- a/screen-redraw.c
+++ b/screen-redraw.c
@@ -236,6 +236,12 @@ struct redraw_build_cell {
 static struct redraw_build_cell	*redraw_cells;
 static size_t			 redraw_ncells;
 
+/*
+ * Bumped once per redraw_client_damage() call (one client's one redraw
+ * pass) - see redraw_damage_refresh_status().
+ */
+static u_int			 redraw_status_serial;
+
 /* Context for building the scene. */
 struct redraw_build_ctx {
 	struct client				*c;
@@ -2216,6 +2222,17 @@ redraw_pane_scrollbar(struct client *c, struct window_pane *wp)
  * whenever PANE_NEWSTATUS is not set, leaving a pane's border-status title
  * blank until some unrelated redraw happens to touch it (e.g. a focus
  * change or window resize).
+ *
+ * wp->status_screen/PANE_NEWSTATUS are per-pane, but the formatted content
+ * (window_make_pane_status() expands pane-border-format, which can read
+ * per-client fields like #{client_name}) is per-client. Gating purely on
+ * PANE_NEWSTATUS would let one client's damage pass render its own text,
+ * set the flag, and leave every other client's pass - this tick or any
+ * later one, since nothing else clears it here - reusing that stale,
+ * wrong-client text. redraw_status_serial (bumped once per
+ * redraw_client_damage() call, i.e. once per client per pass) still
+ * dedupes repeat calls within that same pass, but forces a fresh,
+ * correctly-client-formatted render on every distinct client/pass.
  */
 static void
 redraw_damage_refresh_status(struct redraw_draw_ctx *dctx,
@@ -2224,13 +2241,29 @@ redraw_damage_refresh_status(struct redraw_draw_ctx *dctx,
 	struct redraw_span	*first;
 	u_int			 width;
 
-	if (wp->flags & PANE_NEWSTATUS)
+	if ((wp->flags & PANE_NEWSTATUS) &&
+	    wp->status_serial == redraw_status_serial)
 		return;
 	width = redraw_pane_status_width(dctx, wp, &first);
 	if (width == 0)
 		return;
+	log_debug("%s: regenerated pane %%%u status for %s", __func__, wp->id,
+	    dctx->scene->c->name);
 	window_make_pane_status(wp, dctx->scene->c, width, first);
 	wp->flags |= PANE_NEWSTATUS;
+	wp->status_serial = redraw_status_serial;
+}
+
+/* Whether the cell at (px, py) in screen s is a padding cell. */
+static int
+redraw_screen_cell_is_padding(struct screen *s, u_int px, u_int py)
+{
+	struct grid_cell	gc;
+
+	if (px >= screen_size_x(s))
+		return (0);
+	grid_view_get_cell(s->grid, px, py, &gc);
+	return ((gc.flags & GRID_FLAG_PADDING) != 0);
 }
 
 /*
@@ -2256,7 +2289,6 @@ static int
 redraw_span_cell_is_padding(struct redraw_span *span, u_int x)
 {
 	struct screen		*s;
-	struct grid_cell	 gc;
 	u_int			 px, py;
 
 	switch (span->data.type) {
@@ -2278,10 +2310,7 @@ redraw_span_cell_is_padding(struct redraw_span *span, u_int x)
 	default:
 		return (1);
 	}
-	if (px >= screen_size_x(s))
-		return (0);
-	grid_view_get_cell(s->grid, px, py, &gc);
-	return ((gc.flags & GRID_FLAG_PADDING) != 0);
+	return (redraw_screen_cell_is_padding(s, px, py));
 }
 
 /*
@@ -2308,6 +2337,26 @@ redraw_damage_grow_span_clip(struct redraw_span *span, u_int *xp, u_int *endp)
 		(*endp)++;
 }
 
+/*
+ * As redraw_damage_grow_span_clip(), but against an explicit screen: px0 is
+ * the column in that screen corresponding to span->x, py the row. Used for
+ * a span's separately rendered content (e.g. a pane's prompt) that isn't
+ * span->data.p.wp->screen (or whichever grid redraw_span_cell_is_padding()
+ * would otherwise consult for this span's type), and so has its own,
+ * unrelated wide-character boundaries at the same columns.
+ */
+static void
+redraw_damage_grow_screen_clip(struct redraw_span *span, struct screen *s,
+    u_int px0, u_int py, u_int *xp, u_int *endp)
+{
+	if (*xp > span->x &&
+	    redraw_screen_cell_is_padding(s, px0 + (*xp - span->x), py))
+		(*xp)--;
+	if (*endp < span->x + span->width &&
+	    redraw_screen_cell_is_padding(s, px0 + (*endp - span->x), py))
+		(*endp)++;
+}
+
 /* Recompose a pane's prompt over a damaged section of its display row. */
 static void
 redraw_damage_draw_pane_prompt(struct redraw_draw_ctx *dctx,
@@ -2317,7 +2366,7 @@ redraw_damage_draw_pane_prompt(struct redraw_draw_ctx *dctx,
 	struct window_pane	*wp = span->data.p.wp;
 	struct tty		*tty = &scene->c->tty;
 	struct screen		 screen;
-	u_int			 px, width, prompt_y;
+	u_int			 px, width, prompt_y, x0, x1;
 
 	if (wp->prompt == NULL || wp->sx == 0 || wp->sy == 0)
 		return;
@@ -2329,12 +2378,25 @@ redraw_damage_draw_pane_prompt(struct redraw_draw_ctx *dctx,
 		return;
 
 	redraw_make_pane_prompt(wp, &screen);
-	px = span->data.p.px + (x - span->x);
+
+	/*
+	 * x and n were clipped and grown against wp->screen, whose character
+	 * boundaries have nothing to do with the prompt's separately
+	 * rendered screen - realign the range on the prompt's own grid
+	 * instead, clamped to this span so it cannot bleed into a
+	 * neighbouring one.
+	 */
+	x0 = x;
+	x1 = x + n;
+	redraw_damage_grow_screen_clip(span, &screen, span->data.p.px, 0, &x0,
+	    &x1);
+
+	px = span->data.p.px + (x0 - span->x);
 	if (px < screen_size_x(&screen)) {
-		width = n;
+		width = x1 - x0;
 		if (width > screen_size_x(&screen) - px)
 			width = screen_size_x(&screen) - px;
-		tty_draw_line(tty, &screen, px, 0, width, x, y, NULL);
+		tty_draw_line(tty, &screen, px, 0, width, x0, y, NULL);
 	}
 	screen_free(&screen);
 }
@@ -2486,6 +2548,7 @@ redraw_client_damage(struct client *c)
 		redraw_free_pending_damage(c);
 	if (TAILQ_EMPTY(&w->damage) && TAILQ_EMPTY(&c->pending_damage))
 		return;
+	redraw_status_serial++;
 
 	scene = redraw_get_scene(c);
 	if (scene == NULL)
diff --git a/tmux.h b/tmux.h
index f701d7e48..548590e8f 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1449,6 +1449,7 @@ struct window_pane {
 	struct screen	 base;
 
 	struct screen	 status_screen;
+	u_int		 status_serial;
 
 	TAILQ_HEAD(, window_mode_entry) modes;