I’m not experiencing this, but after the previous release I had to raise a support ticket around conditional formatting (in that case, I couldn’t independently edit multiple rules i.e. if I tried to tick the ‘Reverse colors’ tickbox for the second rule, the UI would jump up to the tickbox for the first rule, and would not let me tick it).
It was fixed via a patch release, so I suggest you raise a support ticket. It was super annoying while it was broken.
While I was waiting, I did a somewhat laborious workaround:
save the query to a new dashboard
convert the dashboard to a LookML dashboard (i.e. create a new .dashboard file)
go into the IDE, open the .dashboard file and manually edit the LookML
open the dashboard, and click ‘Explore from here’ on the tile to get a properly-functioning viz
I experienced this the other day and it drove me insane. I ended up asking a colleague if they were in dev mode and they confirmed they were. I asked them to get off of it and it fixed the issue for us. My hypothesis is that he was viewing the report in dev mode and there was some sort of conflict. Glad to hear it might be fixed soon.