How long are saved filters saved for? On https://abj.miraheze.org/wiki/Special:RecentChanges even when logged in, it seems they are saved only for a couple of minutes. Jidanni (talk) 11:42, 13 December 2020 (UTC)
Topic on Help talk:New filters for edit review/Filtering
In theory, forever.
I checked on the ones I use since years now, and they are still working. I just created a new one (on Chrome) and it works on a Wikimedia wiki.
Please note that I have limited competency about solving issues on third-parties installations.