My point being that they aren’t chewing to get free, they’re chewing to get the trap off but they’re misguided by the foot they can’t feel. They’ll chew out of boredom as well. Look at the chewed up sticks in the area.

I've caught hundreds of coons in DPs over the years and have never seen one chew on itself. They will chew up everything in the area but have never seen any self inflicted damage.

Looks like beavers have been in the area if a coon is caught around cover, lol.