Red and Brown Mushrooms can't be grown into Huge Mushrooms in Nylium, while they can in all other grass-like blocks, like the Grass Block, Podzol and Mycelium.
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I disagree, and I would go other the other round: many fungi and grow there, this shows it is a good block for fungi to grow, also, mushrooms too are Nether fungi, so why would they not grow in a soil for fungi, even more specifically Nether fungi like them?
why would you try to grow it on nylium, that's closer to being netherrack, this isn't really so much of a bug