My comments in preview mode are cut to first X pixels.

There was similar regression a few months ago, but then IIRC it was fixed.
Now, any comment of non-trivial size cannot be previewed - only the first part (cut at 200 or so pixels) is visible in preview.

That makes commenting highly risky, especially if you later on cannot edit your own comments. And always editing later on your own comments is bad and people generally avoid it.

IMO it's critical as it impacts the adoption of Confluence. People who want to polish their thoughts before posting will hate Confluence with this bug.