The Bug:

The cooldown state of evokers turning blue sheep into red sheep isn't saved to NBT.

Steps to Reproduce:

1. Give yourself a sheep spawn egg that spawns blue sheep by using the command provided below.

   /give @s minecraft:sheep_spawn_egg[minecraft:entity_data={id:"minecraft:sheep",Color:11b}]

2. Summon multiple sheep using this spawn egg and then summon an evoker nearby.
3. When the evoker converts a blue sheep into a red sheep, observe its cooldown before it can do it again.
4. Wait for the evoker to convert another blue sheep into a red sheep and as soon as this happens, quickly exit and reload into the world.
5. Observe if the evoker ignores its cooldown and immediately converts another blue sheep into a red sheep.

Observed Behavior:

The cooldown state of evokers turning blue sheep into red sheep isn't saved to NBT.

Expected Behavior:

The cooldown state of evokers turning blue sheep into red sheep would be saved to NBT.