PureMac 2.1.0 fails code signature verification on Apple Silicon macOS

[mywei-big]

Installed PureMac 2.1.0 from GitHub Releases and also tested Homebrew Cask / momenbasel/tap. All produce the same result on Apple Silicon macOS:

codesign --verify --deep --strict --verbose=2 /Applications/PureMac.app
/Applications/PureMac.app: invalid signature (code or signature have been modified)
In architecture: arm64

spctl --assess --type execute --verbose=4 /Applications/PureMac.app
/Applications/PureMac.app: internal error in Code Signing subsystem

codesign -dv /Applications/PureMac.app shows:
Identifier=com.puremac.app
TeamIdentifier=H3WXHVTP97
Runtime Version=26.4.0
Info.plist=not bound