Sync Marker validation check fails on Follower anim sequence with an active Mirror Table when Leader anim sequence is playing backwards

Validation fail

• add two sequence players nodes to an anim graph (A and B)
• make both have the same sync group name
• make A have a playrate of -1, and also have its SyncGroupMethod to AlwaysLeader
• make A be mirrored by adding a mirror node after its sequence player node
• make B have its SyncGroupMethod be AlwaysFollower (and not be mirrored)
• play and see validation check fail