Backpack Stuck

https://gyazo.com/36d6c76a56e67d2c6ed27cbf7462f41f

The backpack stays in the air when equipped, it does not reappear if you try to equip it again. Leaving the game removes the backpack and I am able to equip it again but the same error above happens.

Enviroment: Paper-277 | 1.18.2 MCCosmetics 0.2.0-68a60ba0