Strange modifier behaviour

[qw3ry]

Alt + Ctrl behaves like AltGr, that's fine.
But the following seems to mess up this behaviour

Steps to reproduce

1. press and hold AltGr
2. press and release Ctrl

• Expected result: AltGr still recognized as pressed
• Actual result: Alt recognized pressed

You can swap Alt and Ctrl and get the same behaviour.
If you press and release both Alt and Ctrl no modifier key is recognized as pressed anymore

[waldobronchart]

Thanks for reporting