I updated the mod from version 1.2.2 to the latest version on Fabric (1.3.1).
However, I had two cats with names that have now changed skins, and look completely different. One of them was black.
While this would not be a problem because I could either find a new black cat or summon one with commands, no black cats seem to spawn when I run the command. And the cat that spawned at a witch hut was also not black. Is there a way to solve this? Idk if you have custom commands for the different cats. (My GF wanted a black cat named after her, so I really want it back)

@Hypnotic-Sheep
/summon minecraft:cat ~ ~ ~ {VariantID:"minecraft:all_black", Variant: "minecraft:black"}

Or you can change the model of an existing cat as follows:
Write a command by aiming the crosshair exactly at the cat
/data modify entity
You will be prompted for the cat's UUID, select it.

complete the command to look like this:
/data modify entity fc81d18b-0353-4c53-96ca-88bd011df1df VariantID set value "minecraft:all_black"
Might have to repeat for Variant: "minecraft:black"