This bug only occurs in Minecraft Realms.
When a player is wearing an Elytra, the Elytra turns transparent when the player is not holding an item. This affects both enchanted and un-enchanted Elytra's. (See attachments)
The Elytra turns visible again when the player is holding an item in any or both hands.
This does not occur in Singleplayer and Multiplayer; only Realms.
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[media][media]

Dupe of MC-99353