when typing /locate buriedtreasure then clicking enter in version 20w09a and jumping then using the elytra by pressing jump again you get stuck in the elytra animation even after you hit the ground. The only way to get rid of this glitch is to save and quit and then re-open the world. Saving takes a long time as well. You can still jump normally but not get out of the elytra animation. Rockets don't work while in the glitch.
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Also MC-90026.
This was caused by lag from the locate command. See MC-126244.