That would be near impossible to happen and even have the valve seal at all.
They are just slamming a quickie valve job on there and sending them out the door.
I'd rather they not even do a valve job at all. It should reduce the cost of the head some, and I can count on one hand the number of times I've used an out of the box valve job on anything.
If my name is on the work, it has to be all my work. It just isn't worth the hassles if there is an issue later on. And for the most part, I'm not big on a 3 angle valve job.
Most ports need at least 4 if you can fit the angles in there and the exhaust should always be a radius.
