The "Left Thumbstick Button" and "Right Thumbstick Button" events on Linux do not trigger with the thumbstick is clicked. Testing all gamepad input, clicking the thumbstick in appears to call the Left/Right Thumbstick Down event.
This does not occur on Windows - Thumbstick Button events do trigger when thumbstick is clicked.
No - Same behavior occurs on 4.15.3 on Linux (CL 3450819)
Print Message does not appear on screen
Clicking the thumbstick button triggers the "Thumbstick Button" event
Head over to the existingAnswerHub thread and let us know what's up.