I had a user enable then disable the new "full view" lightning record pages. The problem is that when she switched back to the older view, the Lightning Record Pages all reverted to the original system default page, rather than the custom page that was assigned as the org default.
Pages that were assigned by app, record type, and profile seem to have remained as they were, but any pages that were not specifically assigned (just as org default) reverted back to the original system default that lands on the "related" tab, includes a "news" tab, etc; and NOT the page that was assigned as the org default.
This seems like a big SF oversight when toggling back and forth between views... I can't really think how she could have reassigned an org default some other way so I have to assume this is kind of a bug. Anyone else encounter this?
I guess the really worrisome part is that I can't even see a "System Default" Lighting Record Page option to delete; it's an invisible setting that I never ever want to use and can't delete and just popped up again out of nowhere. Please correct me if I'm wrong on this!
Still happens in October 2025. The solution is to keep sandbox/backup up to date to restore previous org default assignment.
