Windows: Releasing the Alt Key always activates the Menu, even if Ctrl was pressed

In a Qt 6.2 application (i took the mdi example) do the following:
Press and Hold Ctrl
Press and Hold Alt
Release Ctrl
Wait at least on Second
Release Alt

Result: The menu becomes activated ("File" is inverted).
Many other applications i tried (Visual Studio, MS Office, Adobe Acrobat reader) behave different: If Ctrl was pressed before or while Alt Down, releasing the alt key will not activate the Menu.

Why is this important?
In mouse operations we want to use many modifier keys in order to modify the behavior of mouse actions (switch to zoom mode, quadratic versus rectangle input etc.).
In the current state, if we use the Alt key, this leads to activation of the menu, which at least is disturbing.
Is there possibly a work around for this?