The vines region (lower 3 layers) of a huge fungus seldom generate wart blocks that aren't attached to the main body of the tree and are free-floating (see attached screenshot)

While, due to the way each block in a huge fungus is independently generated from the others, it is possible for a huge fungus to generate with no blocks attached to the stem or even no hat blocks at all, the chance of this occurrence is many orders of magnitude lower than the chance of the vines region of the huge fungus producing floating blocks.

Steps to Reproduce:

• Either fly around in a warped/crimson forest until you see floating blocks
• Alternatively go to these coordinates (/execute in minecraft:the_nether run tp @s -284.97 60.81 -299.38) in this seed (-1849291225026860980)