At the moment the token browser for the email body field does not show tokens for the current node / entity which is being transitioned. I only see the:
Current date
Current page
Current user
Random
Site information
Users
Tokens. It would be nice to also have the tokens listed for content being transitioned and the usual other tokens such as the link to edit the content, view the latest revision (for editors).
Fixed
3.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.