Fabric 1.20.1-0.16.0
Things 0.3.3
LevelZ 1.4.13

In LevelZ, the player can begin the game with a low speed level; but as they increase their agility level, so too can their speed. However, when the Socks from Things are equipped, the player's speed is set to 1.6, not added; and when they are unequipped, they are set to 1.0 not subtracted. Dying alone doesn't solve this issue; instead, the player must rejoin the server.

1. Install LevelZ and Things
2. Take note of the player's speed via LevelZ's skill menu; it's recommended to have their speed set to over 1.0 via increasing the player's agility stat level (/playerstats [player] set agility [integer])
3. Equip the socks and check the player's speed
4. Unequip the socks and check the player's speed

Also notice the change in the FoV when testing the Socks.