It did not take long to notice that the Warped Wart Blocks on Warped Huge Fungi and the Netherwart Blocks on the Crimson Huge Fungi were not decaying when all adjacent Stems were removed.

How to Reproduce:

{} Simply mine all of the Crimson or Warped Roots from a Crimson/Warped Huge Fungi, and you will find that the Warped Wart and Netherwart blocks do not decay.

This may be intentional, but I'd like to propose an idea with this:

Possibly have Warped Wart Blocks decay and then have a small chance to drop a Warped Fungi. Same goes for the Crimson variant. Possibly have the Netherwart Blocks decay and have a small chance to drop Crimson Fungi and/or a Netherwart. This is probably not the place for recommendations; but as it could be an unintentional bug, I added a possible solution that would probably go over well with the majority of players. This change would allow players to reproduce Crimson and Warped Huge Fungi and further encourage an extended settlement in the Nether.