[MCPE-175697] Monster Spawner doesn't spawn Mooshroom

So when you spawn a mob spawner and put a Mooshroom spawn egg in it, it doesn't spawn no matter how long you wait.

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Have you tried adding light? Animals generally require light levels > 7 to spawn naturally, and mooshrooms require light level > 11 (MCPE-66830).

From my testing, it seems like for the spawner to spawn a Mooshroom, there mist be some mycelium around it, much like how they spawn naturally