I have a nagging bug for a long time when opening/closing topics that are assigned. It’s a much narrower use case, very much not what the report here is about, but there’s a slim chance the underlying issue is the same.
Here’s the PR for the other bug: DEV: Fix a rare bug where topic scrolls to OP unexpectedly by pmusaraj · Pull Request #34713 · discourse/discourse · GitHub, its repro steps are quite different, they’re related to the assign plugin (PR has specifics). But maybe, maybe… the fix can do something for your use case as well. One can always hope!