This is with experiments turned on for bundles and 1.21 features (but not villager rebalancing).

I'm in seed 5349, and the place where the cats get stuck is -199 / 71 / -336. {edited to add minus sign} I had three following me, and all of them got stuck here. I did not walk here, so they went here by themselves.

I couldn't even nudge them around the corner, whether sitting or not. They would move around the corner, but as soon as I released them from sitting, they walked back to this spot and stayed there. I finally had to take three leads and pull them over, and drag them to my home base.

This could be hard to reproduce unless all cats get stuck in this particular location. But maybe others have seen a recent "cat stuck" phenomenon.

Note that teleportation wouldn't work, either, even over all-dry ground.