UTM.app for virtualize macOS only use Virtualization framework, not QEmu. But this functional won't work either. I have this issue on macOS 15.0 beta (24A5298h), Xcode 16.0 beta 4(16A5211f) : ... Failed to find asset: com.apple.fm.code.generate_small_v1.tokenizer - no asset Domain: ModelCatalog.CatalogErrors.AssetErrors ...

P.s.: No one VM (UTM, Parallels, or other programs based on Virtualization Framework) can be used for macOS beta testing purposes, because there is no AppleID auth (update, install TestFlight, and so on...), also you cannot install beta directly without update your host system to new framework (what framework they wan't idk )