Problems with 4.7.6->5.7 upgrade

Ran into problems with a standard 4.7.6 -> 5.7 upgrade path with the casetracker module. Following the upgrade, the "projects" data seems corrupted. All of our cases that were filed seem to refer to non-existent project. When I click to view "all projects" then indeed no projects are given. However, if I go through "admin->content management" and do a filter for content with the "project" type, I then see the project indicated. So, the project node is in there...somewhere.

Looking directly at the mysql tables, I find that the casetracker_project seems to give correct data for the "project" node (i.e. correct node id). I also noticed that the content_type_basic_project and content_type_basic_case tables were empty. I don't know if that is where the problem is?

We run a lot of contributed modules, and this was the only one where the upgrade failed. So I am fairly certain the correct upgrade steps were followed. Just to be sure, I blew away our work and tried a second time -- same result however.