One can use the tutorial for reproducing the issue:
https://doc.qt.io/qtinstallerframework/ifw-tutorial.html

After installation, try to launch maintenance tool and it is going to fail. Codesign is going to return something like:

chenluqiao@MBP-J46PXK2GHH QtIfwTest % codesign --verify --deep --strict --verbose=2 ./maintenancetool.app
./maintenancetool.app: invalid Info.plist (plist or signature have been modified)
In architecture: x86_64

I am not sure about what that x86_64 mean, but I am using a M3 MacBook.

BTW, "binarycreator -s" does not help here. I think the argument is for signing the installer itself, so it cannot help with maintenance tool.