I am not really sure what happened, When you fly, get hurt and then teleport the glitch happens, its hard to capture it in photos so I will explain it too, I was on the ground but the player model was like it was flying with the Elytra. The player keeps glitching even after you move the Elytra wings from the Torso slot.
Easy way to do this, drink a poison potion, glide and then /tp to the ground(You must tp on a block).
And now for the second bug, after I jumped from the edge(with the glitch that I just talked about), I realized that I can glide with it like you can with the Elytra wings and its also infinite because it doesnt take durability, it looks really cool but it is a bug that needs to be fixed(it will be really awesome if you will add an option to fly like this without the wings with some kind of command).