Adjusted speed does not affect sprint-jumping/falling/floating with levitation/floating with NoGravity

When the player's speed is adjusted, the affects are not applied when sprint-jumping. Players under the affects of slowness potions, for instance, can still sprint-jump at nearly normal speeds. They are only slowed during the brief moments that they touch the ground.

Similarly, players in creative mode do not have their flying speed affected by speed potions. It seems Minecraft does not apply these affects to player motion when the player is airborne in general.

Steps to Reproduce

• Give yourself the slowness effect:

  /effect give @s minecraft:slowness 100 5 true

• Start running and take note of the speed at which you're traveling.
• Start running and jumping and notice how you are now traveling much faster.

Observed Behavior

Adjusted movement speed isn't considered when mid-air.

Expected Behavior

Adjusted movement speed would be considered even when mid-air.