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Problem: There is no check for buffer validity before processing semantic tokens response. This can lead to `Invalid buffer id` error if processing request takes a long time and the buffer is wiped out. For example, this can happen after by accident navigating to a buffer from different project which leads to first loading project's workspace and *then* processing semantic tokens. During that time a buffer can be wiped out, as navigation to it was by accident. Solution: Add extra check for buffer validity before processing semantic tokens response.