Mushrooms penetrate blocks and helmets worn by boggeds

The bug

A bogged with a block or helmet equipped on the head slot will have mushrooms visibly passing through it.

How to reproduce

/summon bogged ~ ~1 ~ {ArmorItems:[{},{},{},{Count:1,id:diamond_helmet}]}

Expected results

The mushrooms would be hidden until the helmet comes off.

Actual results

They remain visible.