Copy&Paste issue on Mac after upgrade from v1.8.2 to v1.8.4

Arduino IDE v1.8.4 on Sierra 10.12.6 (OS version didn't change, just IDE upgrade).

This happens often and is quite annoying.

When I copy a text from anywhere (IDE, Notes, Safari) and paste it to IDE.. it pastes twice.
I'm using cmd+C, cmd+V

It happens once in 3-5 minutes, but behavior continues for aprox. 30 sec.:
Text pasted to other apps is pasted once, in IDE - twice.