When moving in Lyra side to side using the B_Hero_ShooterMannequin as the player character, the animation will noticeably stutter whenever you change the direction of the movement. I repro'd this 3/3 times.
Also occurs in //UE5/Main at CL23227333, tested using Source.
Tested this in 5.0.3 at CL20979098 using Binary and it does not occur.
Expected Result: Character moves from side to side without issue
Actual Result: Character moves from side to side, stuttering noticeably when shifting from one animation to the other
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-170739 in the post.