This issue started to appear in the last couple of weeks. And it's annoying because Xcode Cloud actually is based on build duration. Here is a sample:
The whole build took like 10 minutes.
We can easily consume the 25 hours free tier because of these. The crash logs are completely useless. And the failing tests change from one run to the other and on different simulators. I really hope Xcode Cloud team look into this as it's frustrating and kills the whole point of Xcode Cloud (BTW, these issues won't happen on Bitrise).