so on minecraft version 1.21.50, or on previous versions 1.21.44, or 1.21.43. I have experienced this bug, which occurs when we try to create a custom attachable with an animation that runs, and we include the attachable, it won't work, I've been looking for a long time to find out what the problem is, I asked several discord communities, such as blockbench, minecraft bedrock wiki, and bridge, and what did they say? they said "unfortunately you can't add a locator to an attachable, it won't work, it's a bug".

This bug occurs when we try to add a locator to an attachable, and run an animated particle to the locator, when in the game the particle will appear but its position does not match the settings we made,

I already know that this bug only occurs on attachables, if the entity, locator and particle effect run normally

the steps on how I made it, I started from blockbench using "Minecraft Item Wizard" I took the preset helmet part because I wanted to create a custom cosmetic on the player's head, namely angel halo with rotating animation.

I made the animation and ran the animation directly into the attachable file, an example of the addon I gave below, hopefully this is enough to explain everything