Converted my pages to posts. The plugin worked. I can see the posts but the Yoast breadcrumb which I have enabled on the single post page is showing the old "page category" as its root.
so my old page from /home/boatprojects/whatever_page
now shows the breadcrumb /home/boatprojects/whatever_post
instead of the category it is in now /home/boats/whatever_post
Do you know if perhaps the conversion to post process missed a table somewhere that the breadcrumb script is using?