Home button rejection after charging port replacement

I run a repair shop and replace screens and other parts daily with no issue. But yesterday I came across a first:

A repeat customer came in and needed a new lightning port on his iPhone 7. Okay, it took a little while because for the 7s you have to do a complete tear-down essentially.

Nothing went wrong during the replacement, and I tested the the new port and it all worked as it should. Now here’s where the problem is…

Even though I set the screen aside and didnt even TOUCH the home button at all, the phone no longer recognizes its native home button, BUT the digital home button wasnt turned on automatically as it would be if the phone just didnt see a home button period.

Is it possible that I maybe tripped some security flag and the phone disabled the home button as a security measure? Because *nothing* was torn or broken.

I should note that my manager has also in the past noticed some home button wierdness on a different 7 after a tear-down… after he put it back together every time you touch the home button, you hear a loud beep for a second or 2, like a smoke detector, then the phone shuts down. It seems like these are both security issues that has nothing to do with anything physical being broken.