I have this same issue. Publicly written comments I made on someone else's annotations:

are not listed in my user overview
cannot be found through search using the tags used

The only way I can find my own comments back is if someone responded and I received an e-mail alert for it. Then I can find the link to my comment in my mail. Otherwise they're lost to me.

Documented w screenshots here: https://www.zylstra.org/blog/2022/08/hypothes-is-oddity-in-retrieving-own-comments/