You mean for how, when entities on fire die, they drop cooked meat?
That's handled by the EntityHasProperty, EntityPredicate, and EntityFlagsPredicate classes. Its pretty complicated. EntityFlagsPredicate#test is probably what you're looking for.
This is latest.log so I only have limited info, but I see usefulbackpacks blowing up which appears to shut down the event bus preventing further events being fired.
You should be getting an error screen explaining this.