While posting #48, it appears that the underlying page is regular page, i.e., a content entity instance. The fix is trivial, but cannot be done with a config file.
It's easy enough to fix whatever the canonical database (in future, production) and just reflect this down. If that's acceptable procedure, it's what I would do, rather than an updater, which is overkill. But YMMV.
How do we want to handle cases like this?