JButton incorrect behaviour on button release

Reproducible: always
Regression: yes

Steps to reproduce (Example attached):
1. Press JButton with left mouse button and don't release it.
2. While holding left button, press and release right button
Expected behaviour: JButton is still pressed
Actual behaviour: JButton is released.

This is reproducible only on jdk8, awt Button works correctly for all versions.
On MacOS both awt and swing buttons behave like that.