That's what I was going to say. The natural language version actually claims that it leaves the dog behind unattended in every step, even though the following step continues as though it still has the dog and not whichever vegetable it brought back in the previous step.
Either it's not actually good at natural language processing or some element of the solution isn't surviving the shift from the river_cross() tool to natural language output. Whatever actual state it's tracking internally doesn't track to the output past the headline.