7 plus 3rd barty brightness sensor

Hello everybody,

I recently replaced my 7 plus front camera flex assembly by a 3rd party one from aliexpress (the original one had an issue after replacing battery, where when attached, the haptic, sound, and home button will not work. touch id sensor works though).

After the new 3rd party one, everything works fine except auto brightness.

If I re attach the old one, auto-brightness works but I have all the other issues again.

My question, is it a defective light sensor in the new flex? Or is it something else?