revert: partially revert #9894

Vim has a solution to #9892 with fewer side-effects in patch 8.2.3618

src/nvim/buffer.c

@@ -1587,7 +1587,6 @@ void do_autochdir(void)
     if (starting == 0
         && curbuf->b_ffname != NULL
         && vim_chdirfile(curbuf->b_ffname, kCdCauseAuto) == OK) {
-      post_chdir(kCdScopeGlobal, false);
       last_chdir_reason = "autochdir";
       shorten_fnames(true);
     }