Red and brown mushrooms accept bone meal even on blocks not in #minecraft:mushroom_grow_block

The bug

Red and brown mushrooms accept bone meal even on a block on which they cannot grow.

With the newly introduced fungi mechanics in 20w09a this does not seem intentional any longer. Mushrooms can only be grown into huge mushrooms when on dirt-based blocks.

Examples

Here are some examples in videos:

• Brown mushrooms accept bone meal even on a block on which they cannot grow.mp4
• Red mushrooms accept bone meal even on a block on which they cannot grow.mp4

Code analysis

Code analysis by [Mod] Avoma can be found in this comment.