When you touch a mouse area, or a button (derived from AbstractButton) when the stack is busy, the touch system is broken.
When the stack will not be busy anymore, the next Item will receive a press event but no release event.
There are no issue with the mouse, but the issue append on any touch device (iOS, Android, Windows).
The following code illustrate the issue:
If you touch the green area to push a new view, and if you touch it again when the stack is busy: in the next view, the yellow area will only receive a press event if you touch it