How to reproduce:

1. Open the attached project and the only scene in it.
2. Play the scene, click on the button and slide the pointer outside the button. Then lift the button.
3. Notice that the button stays in the 'pressed' (red) state. Subsequent clicking fails to make the button recover its original color (light grey).

Expected behavior:
When the pointer goes out of the button, the color should turn to normal immediately as it's no longer in a 'pressed' state.

Reproducible: 5.2.4f1, 5.3.5p6, 5.4.0b23