The bug

Both nether fungi as well as both mushrooms are members of the #minecraft:mineable/axe block tag. Despite this, all fungi and mushroom types can be broken immediately. As the #minecraft:mineable/axe block tag only exists to control block mining speed, fungi and mushrooms being in this tag is completely redundant.

How to reproduce

1. Place any or all fungi/mushrooms
2. Inspect each in the debug screen

Expected results

As they are instantly breakable, they should not be a member of any #minecraft:mineable/ block tags.

Actual results

They are all uselessly part of #minecraft:mineable/axe.