Seeing similar issues. Recent branches aren't being seen by Xcode Cloud at all. Any new branch starting with release is supposed to trigger a build. After 2 hours nothing. I tried starting manually but the branch wasn't in the list. Verified multiple times that it was pushed and available. It finally showed up long enough to get a build created only to disappear on me an hour or so later along with any history of the build. It's been 20+ hours and it's still missing.