Not sure if this has been reported or not. I have found with several virtualization applications a bug in the running VM counter. After running multiple macOS vms or when shutting down and bringing up one macOS vm multiple times you will get the error that too many vm's are running. Even though all of them are shutdown and the applications closed at the time.
The only solution I have found is to reboot the computer. This started with macOS Tahoe 26 and so far has remained through 26.1. Hopefully reported and fixed in 26.2.