I’ve been struggling with this issue as well.
As suggested by @TheWolf , I tried adding a single bone IK chain to the pelvis and setting the Translation Mode to Globally Scaled. This fixes the looping issue on the root motion animations, but causes the animation to be offset vertically when source and target characters have different heights. If you’re in a pinch, you can go with this solution and should be able to compensate for this offset in the animation blueprint.