Proximity Sensor heating up, not working, tried new assembly.

Hello, I changed the screen on this iPhone 6S, and it ended up needing a new front camera assembly which I didn't have at the time. The phone was used for several days with no sensor installed. Once I had them, I tried a couple of new camera assemblies, and the proximity sensor is the only thing that won't work. The phone screen will not go dark during a call. The front cam assembly also gets warm pretty quickly on the section of cable with the proximity and ambient light sensors when the lcd is powered on. I appreciate any help or ideas. I have fixed many phones and never had this issue before, and want to figure out a solution for the customer. The connector on the logic board does not look damaged to me. Thank you for any help in advance.

I wanted to leave an update in case anyone has a similar issue. I worked on the phone again and tested with a cracked oem screen, and the sensor seems to work fine with that one. I'm not sure why it wouldn't work properly with the aftermarket screen, I did try the sharpie trick on the proximity area just in case but it did not help. I have used several of these particular aftermarket screens and haven't run into this issue with them before.