Shop fail

Depending on how they machined the hole for the sensor, they can be nice or have a very sharp edge around the top that makes it almost impossible to install the sensor without cutting off a sliver of o-ring. Not entirely the shop's fault but they should know to look for it.
The O ring wasn’t cut, it was rolled out of the groove and flattened in a small spot. I replaced O ring and applied a small amount of RTV