If you apply the add-on, the way you hold the spear from the first-person perspective becomes strange.

If you apply an add-on that includes an official one, the way you hold the spear will be strange.

Reproduction procedure 1: Create a new world, 2: Apply the resource pack and behavior pack. 3: Turn on the experimental item as needed and press a new creation. 4: Take out the spear from the creative inventory. 5: Hold the spear. Result: The movement of the left-click hand from the first-person perspective is fixed (no problem with the 3rd-person perspective.) Take out the spear from the creative inventory and hold it in your hand to fix the spear.