Toggleable form still "dirty" after cancel.

Given a toggleable form:

• Click "Edit".
• Make a change to some metadata.
• Click "Cancel".
• Navigate away from the document (go up to the parent folder for example).

Result: warning dialog from the browser, "Confirm navigation - this draft contains unsaved changes...".

May be a side-effect of the Draft feature and not necessarily an issue with toggleable forms?

I will attach a Studio project to reproduce it.