Thumbstick button not working even with replaced stick

I have an Xbox one controller, the board is clean with no signs of liquid damage and no torn traces etc. It had stick drift so the analoge stick got replaced, Everything works perfectly well apart from button press on the stick. The button has been tested and works as it should, and also manually shorting the points under it does not register as a button press on the controller. Has anyone come across this issue and found why? Again the stick and button function fine but the controller shows no input when clicked