I see that there are a bunch of threads related to this issue with older XCode 11 builds, but I just started seeing the isuse with Mac Catalina Beta 8. I am actually seeing the issue with XCode 10 on Catalina. So probably safe to say that it's Mac OS related.
I believe that Is anyone else seeing this issue?
From what we read here, there are some (least to say) problems betwwen new OS beta, new XCode beta. So it seems safer to have them all synced at the latest version (XCode GM and latest MacOS).