I was flying with the Elytra when I ran into a wall and the ground almost simultaneously at a high speed which caused me to not get out of "fly mode" so I was stuck "flying" even after removing and replacing the Elytra. Reloading the world did resolve the problem however.
I have tried to recreate this, but I can't seem make it happen again.
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[media]
This issue duplicates MC-90026