The alternative, oil starvation, would be just as disasterous. Until the filter valve opens the debris is trapped in the filter material. There is no "backflow" to dislodge it. Take a filter apart.
R3 said the debris comes out. I figured that debris would be entrapped but looking online at a bypass filter breakdown, the oil flows past the filter media, so It’s only possible that debris could be picked up and forced in the system.
It should be designed so that the bypass isn’t even a function of the spin on filter, but rather the housing, like every normal differential pressure relief type system.
