Mobs with passengers has some broken movements. Horses will move side ways while there is a passenger on them, this can been seen when a skeleton trap occurs. Skeletons/illusioners/strays, but not pillagers, when strafing while riding on a mob doesn't face at the player properly.
MC-159637
Mobs with passengers have broken movements
Resolved
Fixed
2
Confirmed
(Unassigned)
1.14.4, 19w34a, 19w41a, 1.15.2, 20w15a, ..., 1.16.5, 21w05b, 21w06a, 21w07a, 21w08b
23w13a
Retrieved
Possible duplicate of MC-160332, since this ticket has more information and is updated frequently.