Strange bug with chestplate and armor trims

Hi, I hope I've chosen the right place. I'm new to MCreator and wanted to create new armor using Fabric. So I downloaded the appropriate plugins, etc. I watched a YouTube video to see what I was talking about. I exported the mod, launched the game, and my chestplate looks like it has an elytra model attached to it, but without a texture. When I add any random armor trim, this bug occurs. 
https://imgur.com/a/cHYTJlC