I comfirmed this a strange way. I sent my mac back to apple for repair. Before I sent it 10.15.6 was in my software update but I did not install it. I backed up on 10.15.5 (no sup update).Then they replaced logic board which gave me a new SSD and installed 10.15.5 with sup update.I migrated my data back and no 10.15.6 beta 1 anymore.I uninstalled and reinstalled the Developer Profile and rebooted multiple times. Same thing.So I guess i will have to wait for beta 2.