If not announce it, at least add a way for people to turn it off.

I agree with stjn. Not long after the change happened people immediately complained about it at the technical Village Pump on enWiki.

I would like to say that I mentioned this (or someone else did) a while back on the feedback page, however nothing ever came of it and this has probably existed since the reply tool was first available as a beta feature.

I think I figured out what's going on that causes the filter to break. For whatever reason

goodfaith=likelybad&

gets moved after

title=Special:RecentChanges

in the URL. So I think we've identified what is happening, now to figure out what is causing

I have added Skarmory to this phab case as they too have stated they've had issues with recent changes filters disappearing.

Nevermind, it appears to be associated with hiding edits to categories.

I just found what is causing the filters to vanish. Don't know what causes the thing to happen but I've made progress. Occasionally,
&hidecategorization=1 gets added to the link. If I remove that part of the link my filters come back. Now, what is causing that to get added I don't know.

However, I never do any of the steps described in the original report. It just seems like occasionally, when I'm undoing vandalism, when I go back to recent changes, the URL is the same as if I had my filter that I usually use, however for whatever reason the user-intent prediction filters are completely missing, even though the URL has them still part of the filter (although they don't do anything as they are basically removed from the filter completely). I'm able to fix it by going and doing something else for a few minutes and then going back to recent changes, however it's only temporary. If you think it would be helpful I could probably do a video recording of it happening.

I've been doign some more vandalism stuff recently and I have noticed it is also definitely not browser- or computer-specific as I have had it happen both on my home desktop running Windows 10 and with Wikipedia on Opera GX and my school chromebook running Chrome OS (cause you can't run anything else on a Chromebook) with Wikipedia on Google Chrome. Haven't tested it on my alt yet to see if it might be something preference or script-related but I'll probably do that soon.

If you require more info just let me know and I will provide whatever info you need.