in Default TPose for a few frames after completing montage

I have an ACharacter which attacks when pressing spacebar as such:

BlueprintUE

When pressing the space bar (i.e. Attacking) it plays an attack montage and then resumes playing idle as such:

BlueprintUE

BlueprintUE

But In between for about 1-2 frames the animation goes back to the default T-Pose:

I suspect it’s because the “Sequence Player” node Starts Playing before “On Completed” exec is reached, So how do I fix this?

Note: The “Select” node is a placeholder to simplify the question and is not the source of the problem so please do not recommend adding “Idle” to True pin as well