Comments on posts in home instance not showing up

On posts that I access through my home instance, i.e. any post present in the "Your local instance" feed, nothing appears in the comments section apart from the message "There are no comments", despite the UI suggesting that there are several.

When accessing the post's permalink in the web UI of the instance, the comments show up without issue, even when logged in.

To reproduce, log in to sync with a lemm.ee account, switch to local feed and click on any post that appears to have comments.
For example: https://lemm.ee/post/35476369

For some reason I haven't been able to replicate this on any other instance (tried with .world and .ml, both of which don't seem to have this issue)