Screen very dark after replacement?

So I've replaced my screen with a new one, brought over the earpiece and now the screen is very dark. Face ID works fine and all. I've read that the ambient light sensor if damaged, will result in having the lowest possible brightness.

However, I moved back the earpiece to the original screen and brightness just worked as it should. Then I put it back on the new screen and it doesn't work. Of course, for sanity check, I moved it back onto the original screen and it all just works.

Is it possible that the new screen needs to be reprogrammed first for the brightness to work? What a goofy issue.