I've been experimenting with WAN2.1 in making longer animations. I took the last frame of a 10 second animation and used it as the starting frame of another 10 second animation and then stitched the two together. However, there seemed to be a color matching issue so you can easily tell where the stitch is, but I think the result still came out pretty well.
Attached is the animation as both a .gif and .mp4.