Not sure if this is just on my instance, but most of the time, the /api/notes/children endpoint returns a 500 indicating a timeout in query execution.
this has the effect, that it can't show replies to threads
EDIT: played around a bit (for a couple of minutes) to send different limits and depths params. as soon as i set limit > 1, it timeouts.
EDIT 2: did a bit more digging. seems like either the join on avatar or on the banner (or both) are causing the issue (https://akkoma.dev/FoundKeyGang/FoundKey/src/commit/6efc3b7989bdd6ed0710fd2927b6a5e05077f359/packages/backend/src/server/api/endpoints/notes/children.ts#L55)
EDIT 3: its definitly both. without those 2 joins, the query returns data instantly