Edit histories disappeared after updating catalog to LRC 15.4, can't roll back because backup didn't save lrcat file
I updated LRC today from v15.3.1 to v15.4. Upon loading, it said my catalog was outdated and needed to be upgraded for this version. Afterward I opened the program, and while the edits still seem applied to the photos, each photo’s edits have been wiped from the History panel. I rolled back to v 15.3.1 and went to import the backup it made before upgrading (from the Old Lightroom Catalogs folder) but the backup zip has no .lrcat file in it. All the previous backup zips have their respective .lrcat files, so it appears Adobe broke both the upgraded catalog as well as the backup. My secondary backup is only recent up to a couple weeks ago so I will have lost a lot of work if I have to roll back to that one.
I read in a Reddit thread from 2 years ago that v14 did the same thing to a lot of people, and Adobe quickly released a 14.1 hotfix that apparently fixed it. Hopefully they’ll correct this, just want to register the bug and see if anyone has any other solutions. The backup zip does appear to have the necessary contingency files in it in the “lightroom.lrcat-data” folder, I’m wondering if there's maybe a tool or something that can compile an .lrcat file from that?
(Windows 11, latest update.)
