outputting to multiple server documents

I’m trying to use multiple documents concurrently on a bokeh server, and running into trouble when I want to update the first one after creating the second one with output_server called a second time. Is there some trick to this?

If I go back to the first document using output_server(‘First doc’, session=session, clear=False), add data to the renderer’s data source and then push, I get a phantom second plot instead of an updated first plot.