[MC-307203] Mushroom blocks don't cull-face correctly

Mushroom blocks (red, white, stem) don’t cull when placed together, leading to weird artifacts and worse frame rates.

Steps to reproduce

Create a cube of any mushroom block and fly into it. You will see that the blocks do not cull correctly.

Expected Result

No inner faces should be visible

Actual Result

Inner faces are visible

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I cannot reproduce this

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