Emails can't resolve tokens for non-contact components for recipients added to the list after email form was opened

https://github.com/civicrm/civicrm-core/pull/21745#discussion_r724286717

Affects 5.43 only.

e.g.

1. Create a case email, e.g. clicking on the mail icon in the roles section.
2. Add a recipient to the recipient field.
3. In the body put something like Dear {contact.display_name} Case {case.id}
4. The email sent to the original recipient will resolve case.id. The added recipient will have it blank.

See below this also applies to other non-contact components, e.g. event tokens.