Why won’t the power button work after a screen replacement?

So I had a Huawei P30 Pro come into the shop for the first time for a simple screen replacement.

I replaced the screen and the device seemed to functioned perfectly only to find the power button would not respond and/or turn on or off the device.

I know for a fact it was working before. Still with no solution a second P30 Pro came into our shop a week later for a screen replacement again. I just completed the screen repair only to find it has the identical issue with the power button!!!

anyone have any solutions or come across this before!? I’m out of ideas.