This occurred some time ago already and had been fixed, so I guess it’s a regression. The dropdown filter for Solved status works (the lists are filtered), but the dropdown doesn’t update to the current filter status. It always stays on “all”.
This is on the latest stable version of Discourse.
Another issue I came across is that I can restrict using Solved to tags. But the filter won’t show on tag lists. It only shows on category lists where Solved is enabled, or when enabled on all topics.
Edit: I also use the filter in the theme component Featured Lists. This worked:
Thanks for looking into this @Arkshine! With respect to my component, I published it just two months ago and I’m pretty sure this has been working then