So this has happened on a couple of my posts, but when I saw it affecting @gabe's recent intro post, I thought I'd call it out here.
Here's a screenshot - first image is of how the post looks when you're not logged in, the second is with login:
https://imgur.com/a/lRMP9yf
You can see even though there's two comments listed as being present on the 2nd shot, no comments appear.
So to determine whether this was client side or server side, I tested it out on multiple browsers and got the same result, indicating it's not a client side issue, and it's not related to my kbin extension scripts on Firefox. I can't find any settings within my profile that would affect this (if there's one I'm missing, please let me know).
For reference, here are the two of my posts that I'm finding the same behavior on:
https://kbin.social/m/13thFloor/t/332463/Untitled-by-at-Aphelion-at-mastodon-sdf-org
https://kbin.social/m/13thFloor/t/329335/Untitled-by-at-literarypug-at-mastodon-world
Thanks in advance for your help - I'd like to be able to both promote content and leave a review at the same time, but this bug is making it difficult. Note that this only appears to affect Threads, not Links at the moment.
EDIT: appears to affect Pictures as well, and is currently occurring on this post below. Gonna add @ernest so he has a heads up.
Additional testing shows that it's only affecting newer posts - posts older than two days ago don't appear to be replicating the behavior.
I'm actually gonna test it on this post, as the behavior just repeated it self on a Picture post I placed here, only this time it's removing the first comment even though I didn't post it.