When this mod is loaded alongside Promenade, the latter's new mushroom types cannot be grown into their huge variants using bone meal. The player can use bone meal on the mushrooms and it is consumed and produced particles, but nothing else happens. This works correctly without Enhanced Mushrooms loaded, which means that EM is breaking this feature.

I’m making an issue over Promenade

Alright I looked into it and its actually our problem due to how the MushroomPlantBlockMixin is

fixed in #20