minecraft:item particles flip textures horizontally

Relates to MC-241006 and MC-241036

The bug

The minecraft:item particle generates particles which are flipped horizontally from the texture file itself, as well as what is seen in the inventory.

How to reproduce

1. Obtain a stone pickaxe
2. Obtain a repeating command block
3. Set the repeating command block's command to /particle minecraft:item stone_pickaxe ~ ~2 ~
4. Observe the stick particles that result

Expected results

Since the item form of the stick/handle spans from the bottom left to the top right, this should be how the particles display it.

Actual results

The texture appears to be flipped in the particles, with the stick going from top left to bottom right.