I checked again with the recent 10.15.4 public beta, and the problem exists. I have checked this with competing apps, and all of them have the same problem. I have also gone down the path of checking if this issue is related to iOS. Because only iOS devices are not able to connect to the Mac. I have tested with non iOS phones and it seems to work fine. It also works fine if I use my mac keyboard as a bluetooth keyboard for another mac.Does anybody know of any other emulated bluetooth devices that I can check with? Any pointers?

I faced the same issue. I clicked on add tvOS app. And then the + button next to the macOS app re-appeared. I was able to create a new release. I then clicked on the red "-" next to the tvOS app and deleted it.

I have the same issue. I submitted a paid support request to apple, and they asked me to submit a bug. I did. Waiting, no response. This is from 6 months ago.

for anybody else that has had this problem. This has been fixed in Sonoma.

This bug has been fixed in MacOS Sonoma.