the glider is not compatible with the elytra. intent on that is clear; an error message appears when the player tried to open the glider with an elytra equipped.

however, the reverse order of operations is not handled - while actively gliding, open the inventory and equip an elytra, then press space to active that as well. now, both the elytra and glider are active at the same time. it looks quite goofy, zooming around at mach 12 while visually pointed directly downwards.

as a work-around, craft tweaker can be used to disable elytras:

val elytra = <minecraft:elytra>;
elytra.maxDamage = 0;
elytra.addTooltip("Component of the Advanced Glider.");