If you grow tree on podzol it's not set block under tree to dirt.
And if you grow mushroom on mycelium it's not set block under mushroom to dirt.
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Duplicate of MC-58431

What?

Was fixed in MC-57884

I mean, why I grow the mushroom on mycelium it's not set block under of big mushroom to dirt?

Yes. It was a bug, that was fixed.