Missing approver badge for existing page

Prerequisite: configuration of CR to use 2 approvers minimum

Reproduction steps:

• Edit a standard XWiki page (e.g. Sandbox) that doesn't have any approver set: a warning is displayed explaining that the approvers are missing to the page
• Save as change request: the modal request to set the approvers
• Login with one of the approver user added in the list

Expected result:

• the created CR should use the list of approvers set
• a badge should be displayed explaining the user is approver

Obtained result:

• the CR has an empty approver list
• no badge is put on the diff view specifying that the logged in user is approver