Expected action: Liked comments stay liked after collapsing the top parent comment and then expanding it.
Actual result: the parent comment stays liked but all child comments lose their likes.
How to reproduce:
Like multiple comments in a comment chain, close the parent comment and then reopen it. All child comments will lose like status.
I believe you are correct. It makes it worse though because if I like it, collapse, reopen and notice it didn’t stick, people would notice it didn’t stick. So they end up re-liking it which has the actual effect of cancelling out the original like when refreshed.
This can be avoided by knowing about the issue and why it happens, but that is unlikely for all users to know.