Since the original mesh is hard to see, I re-exported it with a scale of armature 0.01 mesh 1.0.
I put them side by side and compared them to make it easier to understand the cause of the problem.
Then I made a discovery.
Apparently I misunderstood. It seems that the width of the foot movement has shifted, not that the playback has ended in the middle.
Please let me know if there is a way to correct the width of the foot movement.