Wood putty is often used when putting the plywood together and even when it is just different in the laser’s ability to get through it is the bane in working with the stuff, but sometimes it is near impossible to cut. I would much rather go back and add it after than try to cut through it.
It comes in several colors that match various woods but the yellowish oak blends in most. It dries very quickly and can appear to turn into a rock but I have brought it back with hand sanitizer, The hold appears to be mainly mechanical and that is fine in most circumstances filling tiny cracks but I might soften with a bit of wood glue if filling large “blowouts” such as you are finding.
Here is where I first encountered the need of it