I found exactly one model in a single map for gmod that causes this to happen, a better solution would be to re-calculate a valid hull from the supplied points, but this'll do since it's such a rare case.
These legacy style .phy files are literally just serialized compact surfaces
and nothing else, with some misc. data shoved into some dummy compartment.
Some props in shipping HL2 still use this format, as they have a .phy, even after their
.qc had the $collisionmodel removed, as they didn't get the stale .phy in the game files deleted.
Closes: #35