I've had a reoccuring issue of InDesign documents with multiple alternate layouts 'losing' their layout names and placements.

I've attached a screenshot of what my alternate layouts should look like, and then again what they now look like.
InDesign no longer sees it as an alternate layout.

This seems to happen some time after working in a file, or re-opening a file.
No updates have been made to InDesign between closing and re-opening these files.

I'm on MacOS Sequoia 15.6
Adobe InDesign 20.5