When you open a new post which doesn’t contain any comments, you latest comment from whatever post is displayed ever so briefly before the “no comments” message is shown. I managed to screen record it but I’m not sure how to attach a video.
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I reported on GitHub already
I have also noticed my last comment is visible while comments are loading for posts with comments as well.
I encountered this as well when I thought I had accidentally posted a comment joking about board games on a post about the Hong Kong protestor and panicked for a moment. Glad to hear an issue was submitted already.