I experienced this too, for the first time ever. Also been getting hit with massive damage during flying

 

Update - I was flying around a city and died all of a sudden due to this flying glitch

 

keep getting slammed into the ground using fly or elytra

 

I have also been affected by the /fly issue have died once now and taking random damage from flying around.

 

I was in the air flying about 150 blocks over water and died instantly when I double clicked the space bar to disable fly. Lost 5000 xp.

 

Seems to trigger for me when I disable fly (double tap space) while moving

 

Experiencing same issues as above. Slam into the floor and take fall damage (which shouldn't happen at all with fly enabled) if double tap to release while moving during fly.

 

Thank you for the updates Andrew. We appreciate you!

 

Will test the flying stuff when I get on

 

So far I've been able to fly around with my elytra or just in fly mode without any issues , tested with star rocket and elytra and didn't have any rubber banding or slamming into the ground.