I also had this problem today with just one RG (just one that I have identified so far). It was there, working for months, I didn’t change anything related to it and it simply stopped returning data.
The funniest thing is that it returns data for other users, but not for a specific user (which was working before). I checked all the relationships between the data that connects to the user and everything is normal.
For better context, I’m using an RG to preload a list that is used in common elsewhere on the page.
I did the search directly in RG (without going through preload) and the result is returned (the constraints are the same used in the preload approach), I just skipped the preload step for this use case. However, the return has a delay that wasn’t there before.
Remembering that the old approach still works for other users, only this one demonstrated to have this problem.
In this thread shared by @josh , I saw that they started new improvements today:
But I don’t know if it has some relationship with this.