Enchanted tools and armor get a colored glow based on their enchantments rather than the default purple glow.
When equipped/in hand (actually rendered ingame, not just item formú, the glow is just white.
Tried with no mods other than fabric api so it shouldn't be a conflict.
In some cases it's really hard to tell if an item is enchanted, for example a diamond sword almost completely negates the redness.
If intended, it should probably be a config option at least.

1.16.5

Everything in this picture is enchanted:

I'll figure this out at some point, but given Fabric's lack of anything useful it could be awhile