Tokenised input not using revision

When adding an email template with tokens in subject and template body these tokens are replaced from the published entity rather than the entity being transitioned. This seems to stem from a workaround in the processor, which does not have the revision id (https://www.drupal.org/node/2723537) and therefore uses the uuid. We really need to be able to use the revision to populate the tokens, otherwise any changes are not included in the email.

Having looked at the related issue I have made use of the moderation information service to get the latest revision, which given a transition is occurring should (I believe) be the revision we require at this stage.