This suggests it’s likely federation issues
Edit:
Examples:
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Do you use an app? On boost, I can see comments for both these posts natively via my lemm.ee account
Nevermind I somehow blocked the lemmy.world instance accidentally without realising it
I also tried in browser for both these posts I linked and I can’t see their comments
Weirdly I can see the comments in incognito where I’m not signed in
I have undetermined, English and 日本語 (Japanese) set as my three languages with Japanese set because I am learning Japanese