The Bug
When The Creaking is hit by other mobs it doesn't display particles
The parts in the animation and sound have been fixed in 1.21.2 Pre-Release 1.
Reproduce
Get a naturally spawned creaking
Spawn a Warden
Have the Warden agro on the Creaking
Expected Result
Particles would be shown
Observed Result
No Particles were shown
Can confirm. I tested this with zoglins and got the same result.