Front camera working intermittently

I replaced the screen on a 6s and the selfie camera seems to be having issues on Snapchat, Instagram, home screen selfie camera, etc. but it works fine on the regular camera app. It doesn’t crash the app, the camera just shows a black screen. Is it possible for this to be hardware related? It isn’t heat-related and restarting the phone didn’t fix it either. I am assuming this is a software issue but I’m not sure if there is something that these apps utilize in the camera assembly that the regular camera app wouldn’t?