The Creaking mob is gliding around, while the feet are not moving.
This can be observed in the attached video(downloading in the upper right corner is recommended).
Recreation is possible.
It glides around a moment after beeing hit while the player is in creative mode.
This also occasionally occurs on it's own.
I've not observed this behavior while in survival mode, allthough possible.
Thank you for your report!
We're tracking this issue in MC-277129, so this ticket is being resolved and linked as a duplicate.
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