Touch ID No longer works with original home button

We did a screen replacement on an Ipad Air 2 that was returned 3 days later with customer stating that the touch ID suddenly stopped working. I know for a fact that this is the original because I helped the tech transfer it from the old screen and tested it to make make sure that the touch id was indeed functioning. I also know that this is the same home button that was brought back in with the device. Has anyone ever seen a home button all of sudden lose the touch ID function but continue to work after that.