What I expected to happen was...:
I wanted the mob to have an elytra for map making
What actually happened was...:
It sometimes came out normal, but then others would go transparent or change from normal to transparent
Steps to Reproduce:
/summon (Whatever entity can make the elytra visible) ~ ~ ~ {ArmorItems:[{},{},{id:elytra,Count:1}]}
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[media]
Duplicate of, or related to MC-99353