ipad mini 5 touch id works but the home button does not

I had a technician replace the screen on an iPad mini 5 recently and the device came back because the home button was not functioning properly. The technician proceeded to replace the screen again and it was working before he laid the screen down flush into the frame. Now it’s not working again and I’m going to be opening this device to see if it could’ve been two defective screens or maybe a torn home button flex but I was just wondering if anybody has come across this issue and if so, do you know of any solutions if it is not the screen or home button?