Question "Loop Pose" messes up walk cycle

I'm having trouble with a motion captured walk cycle. It's obviously very rough, but I figured I could just loop it to make it work for now. I'm using it for root motion.

This is in 2022.2.0b10.

The first half of this video has Loop Time turned off; the second has it turned on. It's causing the right leg to swing waaaay out, despite seeming to only need to correct a slight jump.

If I make two animator states and continually transition between them, I get great results: the switch is seamlessly smooth. But, alas, I can't plug that into a blend tree.

Does anyone have idea why this is happening? I'll definitely be re-recording this animation, but I suspect I'll be having this issue more than once!