When the Summary input is disabled/unchecked, what should happen to any existing values in the Summary field?

Problem/Motivation

When the Summary input is disabled/unchecked, what should happen to any existing values in the Summary field? - Seems like a follow up but this issue shouldn't tough that.

Steps to reproduce

TBD

Proposed resolution

TBD

Remaining tasks

TBD

User interface changes

TBD

API changes

TBD

Data model changes

TBD

Release notes snippet

TBD