Fences and fence gates cannot be put in furnaces

I'm making a mod where I'm adding a new wood set, but there's a problem, every item from the wood set can be used as fuel in a furnace except for fences and fence gates, I know I can use item extensions for that but I need to know what tag makes them be able to be used as fuel in a furnace. I've added the fences and wooden_fences tags but they do nothing