I searched for a similar issue that I'm having, but all are older versions that I found. I just got an Elytra in an End City, however it wont activate, it wont show animations, nothing. It acts like I'm not even wearing one.
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tryashtar
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Yes, even unequipped and re-equipped it and it does nothing.
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Update: it works in the overworld after leaving the End.
Did you press spacebar (or whatever you have jump bound to) when in midair?