Mushroom island map.

Please explain what bug you are trying to show here. Otherwise this would count as an incomplete ticket and will be resolved as such.

The map shows purple bush its brown in the game.

The mycelium. It's brown on the mushroom island but purple on the map.

Mycelium is a purple-grey colour. Definitely not brown.

Its a bit more purple than I expected though.

Thank you for your report!
We're tracking this issue in MC-139453, so this ticket is being resolved and linked as a duplicate.

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