mouseWheelMove(...) method sometimes not called after wheel moved

If I click with the alt modifier on a generic Component and then I move the wheel of the mouse, the method mouseWheelMove(…) is not called as one would expect. Alternatively if I hold the alt modifier while moving the wheel OR if I click before on the component without the alt modifier and then I move the mouse wheel, mouseWheelMove(…) is called correctly.

In other words alt-click seems to block the mouseWheelMove(…) callback for a reason that I cannot understand.

Is this a bug or I am missing something?

No idea. If you can give me some test code to run, I'll try it.