Engrave doesn't recognize cutout

[erclin]

The issue is with thick Proofgrade plywood having air pockets.

Proof grade not cutting through

Every so often, my proof grade material will not cut all the way through. It seems as if there are small knots in the middle plywood layers that the laser takes longer to cut through. I usually saw through the uncut areas with a razor blade, but sometimes it’s too much uncut material and the whole piece is wasted. Is anyone else having these issues? What can I do about it? If this is common for proof grade, I don’t know if it’s worth the premium - I thought proofgrade should be guaranteed to be …