game crashes when smelting

I was playing on minecraft java edition server play.hoaxMC.com when on /adventure, the game crashes if i put a coal or coal+block on the furnace 

What I expected to happen was...:
the normal way I guess. 

What actually happened was...:
It should not crash that way.

Steps to Reproduce:
1. place a furnace near you
2. put a coal or coal_block in the furnace
3. thats it. the game crashes