I'm using Windows 7.
I've noticed with Beta 4 (first beta I've tried) that when I add a new C symbol (e.g. struct member), if I do Ctrl-/ to search for references, it will tell me that none were found and ask if I want to pop from the stack. I retagged the project (only modified files) and it's still doing it.
Sometimes it works without manually tagging, but after a long time (tagging?). I went back to the 22.02 version and it found all references immediately.
Then I went back to beta 4 and it still couldn't find them.
I'm attaching a screenshot of my references tab. I have the tagfiles folder available if needed.