[1.14.3] Custom Banner Item - Crashes in Loom

[Zathrox]

Hey guys, just throwing this out there to see if any of you guys can figure it out! Basically trying to create a new banner pattern, everything works well in terms of items generating, code loading etc, but when I put the banner pattern in the loom with a banner+dye, I get this error log: https://pastebin.com/J2fwkHA5

This is my item setup:

BannerPatternItem(BannerPattern.create("welshflag", "welshflag", "welshflag",new ItemStack(ModItems.RUBY)), new Item.Properties().maxStackSize(1).group(ModItemGroups.MOD_ITEM_GROUP)), "welshflag_banner_pattern")

 

with regards to my issue, I can see it's something to do with the loom, renderer and client but I can't pin-point what it causing it / how to fix it! but i've been working on this for ages now, with no avail, so passing the baton on! while i work on other things!

as a side note if I do:

/give @p black_banner{BlockEntityTag:{Patterns:[{Pattern:"welshflag",Color:14}]}} 1

it generates the flag perfectly, I can even put the banner on a shield and have it work, however, I think it has something to do with the mini-icons that appear in the loom, not sure if they are a separated template or just a shrunk down version of the shield/banner textures but yeah, help decoding that error message would be great!

[Zathrox]

Anyone able to help with this? Still stuck with what is causing the issue, from all the different variations i've done, can't seem to get it to work