Warped and crimson fungus don’t grow into 3-block thick variants anymore

In a certain 1.16 snapshot, a bug appeared where crimson and warped fungi never grow into the 3-block thick variant.

What I expected was…
When I grow crimson and warped fungi, it sometimes grows into a three block thick huge fungi.

What actually happened was…
It always grows into the one block thick variant.

How to reproduce:

1. Bonemeal warped and/or crimson fungi.
2. it never grows into the 3-block thick variant.