Yes I got stung by that upgrade too, on one component...
All was fine except all within-component hyperlinks were faulty, a bit fatal for a book-viewing-application. So any page and paragraph could be correctly asked, but any link clicked there went wrong. For me you could see the parameters weren't all lost, it was between JRoot
and "?q=Y&r=Z" parameters a faulty part /com_mycomponentname got
inserted, as well as the first parameter "p=X&" missing. (Variables p for book, q for page and r for paragraph, each defaulting to one if not supplied.)
See e.g.
https://github.com/joomla/joomla-cms/issues/19504 --- someone else in trouble gets it fixed with a specific patch.
For me the solution was as simple as restoring to the Akeeba Backup that's automatically made just before updating, because my data are static (classic books, not updated catalogs).