The plastic coating applied to the back makes the panel too thick. The screws should be an eighth of an inch longer. In addition, if there is a dimmer, the thick plate prevents you from being able to turn the dimmer on and off. I removed the back plastic cover (easy to do) and it worked. I don't know why there is a pad because without it the plate is strong and I've used metal switch plates for decades with no bump issues.
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