The 8th time, I changed my guest back to Sotha, and it failed (same perma black screen). The 7th time, I changed my guest from Sotha to Shor, and was able to enter Shor. The 6th time, friend group-queued me in and it DID NOT work. The 5th time, I tried Sotha again and it failed again. The 4th time, I tried Vivec and it worked. I tried 3 times, failed each time and had to kill the process. Vivec and Shor work fine (I didn't try Kyne).