Minecraft – No mobs are spawning in the Mob Farm (in the Mushroom Island biome)

minecraft-java-edition

I have a problem with my mob farm spawning room (16×16) and it's that there's no mobs spawning in it.
I'm playing single player Minecraft 1.10 on hard difficulty and I have built it in a Mushroom Island so there's no other place for the mobs to spawn and It's mention that it is 30 blocks high.

What do you think is the problem?

Some pics:

Spawn Room
Spawn Room

The Roof

enter image description here

Best Answer

I have built it in a Mushroom Island

No mobs other than mooshrooms spawn naturally in mushroom island biomes. Unfortunately, you will need to rebuild the farm in another biome for mobs to be able to spawn.

Here's a test I did, showing that no mobs spawn in mushroom island biome:

Quick mob spawning test

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