Winter's Touch appears to have its enchant layer bugged. (as you can see in the picture part of the coal is glowing).

Versions:
Minecraft 1.18.1 (Fabric Loader 0.13.3)
MCDW 4.2.3

This issue does not appear to be exclusive to the Winter's Touch. Thanks for catching this

This seems to be an issue exclusive to weapons that have innate enchantments. Somehow though, it also happens with the Bee stinger weapon

There seems to be no discernable pattern on the weapons that do and the weapons that don't.
The following do have this issue:

While these ones don't:

It's most likely a texture problem. Probably oversized transparent areas are included as an enchantment layer.

You are more than likely correct. As you might imagine, this will take some amount of time to correct so we will leave this issue open until we do correct it. I'll also make note here if any other factors are at play if I discover them. Again, thanks for finding this!

Found a way to fix them. I'll keep working on it as a separate temporary resource-pack.