Our site's funnel page URLs are session based, so in order to actaully see the page in the editor we have to update the editor URL. But in a multi-page test, we might target multiple URLs for one section (ie. we have several checkout pages, so we would target all of those URLs in one "Checkout" page section).
So, if I build a test then come back the next day to continue poking at it, I have to update the editor URL again to see the changes on the page within the editor. When I do that, it clears out all the additional URLs that i added in my URL targeting which is not helpful and messes up my test.