The bug

When growing a warped or crimson fungi with bonemeal, if there is a block of fire above it, then the fungi grows, skipping past the fire.

How to reproduce

1. Place a block of crimson or warped nylium down
2. Place the corresponding fungus on the nylium
3. Place a log, plank, or other flammable item above the fungus
4. Set the plank on fire from the top using flint and steel or a fire charge
5. Bonemeal the fungus until it grows into a giant fungus; you should see that the oak log and the fire are still there