The Bug:

Sculk sensors are not activated upon a sheep changing from blue to red, through the use of an evoker.

Steps to Reproduce:

• Summon an evoker.
• Summon a sheep.
• Dye the sheep blue.
  →  Notice how when the sheep changes colour, the sculk sensor does not activate.

Additional Information:

Quote from the 20w49a Changelog, "A vibration is anything that causes physical motion". I would definitely consider this as physical motion, as the sheep is physically changing colour. This is most likely a Won't Fix, or a Feature Request, since this feature is an Easter Egg within the game. However, I just wanted to report this, to let the team decide. Closely relates to MC-210334.