I don't search often so I can't say for certain it's the beta but it used to work consistently and now it doesn't, even in safe mode. No results returned no matter how long I wait.
I'm running the latest MacOS Catalina.
I also tested in MacOS Mojave (unraid VM), same result.
I have a Raspberry Pi shared over SMB where search from the same two clients works fine.
Diagnostics from safe mode attached.