Plugin Button1Up fires when I let go of mouse button 2

Correct: Mouse button 1 up/down fires correctly.
Issue: When holding down Mouse button 2, if I dont move the mouse, then mouse button 2 up is fired after letting go. But immediately afterwards Button 1 down is fired and then button 1 up is fired.
Correct: If I do Mouse button 2 down and move the mouse, when I let go of the mouse button Mouse button 2 up fires and neither Button 1 up/down fire.

This seems to be related to the right click pulldown menu, as when it is toggled, it seems to trigger button 1 up and button 1 down.
video:

empty place with gui for test: Plugin button issue.rbxl (56.1 KB)
lua script to put into plugins folder:
PluginTest.lua (782 Bytes)

Expected behavior

Letting go of mouse button 2 should not fire mouse button 1 up/down

Found someone to take a look, we’ll update you as soon as we can :slight_smile: