Issue - MCPE-187406 - Custom Color Trim Issue

### Resource Pack Issue

When making a custom color pallette for armor trims and applying in-game, appears as empty slot (same as minecraft:air) in inventory but functions as a model when equipped.

Issue link: https://bugs.mojang.com/browse/MCPE-187406

Video Representation: https://bugs.mojang.com/secure/attachment/592702/km_20241012_720p_60f_20241012_135200.mp4