The Bug:

Mace smash attack can push players in creative mode that are flying.

When players in creative mode are flying, they are usually unaffected by being pushed except when colliding with an entity. For example, players in creative mode that are flying take no knockback from TNT explosions as expected.

Steps to Reproduce:

1. Get two players and label them "Player A" and "Player B".
2. Get both players to enter creative mode and get "Player A" to start flying around one block off the ground.
3. Place an armor stand near "Player A" and have "Player B" obtain a mace.
4. Get "Player B" to perform a mace smash attack on the armor stand and observe if "Player A" is pushed.

Observed Behavior:

Players in creative mode that are flying can be pushed.

Expected Behavior:

Players in creative mode that are flying would not be pushed.