I don't fly anymore after joining a world

1. Get creative

2. Flying (a little above the ground and not high in the sky)

3. Leaving the world while being in flap

4. Join the world you just left

5. (Maybe), during the generation of the world, you will fall back to the ground

6. Video link (Google Drive):

https://drive.google.com/file/d/1LVR99LuypdKGvd8_H2H-fVslY5era9jH/view?usp=drivesdk