Seamless looping animations?

So I’m trying to get an animation to loop seamlessly on an avatar and without a ramp-up in animation speed.

I can get the animation to loop with no issue by either adding a duplicate node in the animator window and setting up a pair of transitions back and forth or by just checking the box to loop the animation in the inspector window. Looping is not an issue.

My issue is the change in play speed as the animation finishes its run and begins the next loop. Is there any way to prevent this ramp-up/ramp-down? All I’m looking for is a constant and perpetual rotation animation. I’ve seen it in worlds so I assume it’s possible for avatars. Am I missing something obvious and I’m just looking too hard?