@cgreco thanks, I missed your thread and the related one here Refresh browser fix with force_stream_order.
As suggested in that thread, I tried setting force_stream_order to False and that removes the duplication but it turns off an equally important feature.
Unlike the others, I was not using a named session. I tried with a named session and got the same results.
@ines it's not always quick to create a new recipe with the same logic and that is shareable on a public forum. I thought confirming that I'm happy with the output of the recipe from it's yield statement is a good checkpoint. I'll try to create a self-sufficient case but at the moment it seems that the problem is more general given the other threads.