Problem/Motivation
There were a few reports of failed updates from 8.6.x to 8.7.x where the underlying problem was that the UUID stored in the last installed field storage definitions didn't match the one from the live definitions for configurable fields.
Proposed resolution
Make unique storage identifier differences be reported as a missing/needed field storage update by the entity definition update manager.
While this change wouldn't have helped directly with the failed update, it would've made site admins aware that there is a problem with (some) fields that needs to be fixed.
Remaining tasks
Review.
User interface changes
Nope.
API changes
Nope.
Data model changes
Nope.
Release notes snippet
Nope.