I have seen this several times over the years. They have all come off of engines that were running HOT HOT HOT...
You can also see where it embedded at the flange from the heat as well.
If the oil temp never gets over 300 then you will not see this happen. The only way to prevent it is to cool down the oil.
You will have to get a new one from USLC...
Good luck, Randy - RPM