It turns out issue #19 (closed) also affects Email API 2.x. This is the fix.
To replicate:
- Create a message template with a contribution token (e.g.
{contribution.total_amount}. - Create a CiviRule that triggers on a contribution that sends an email using said template.
On CiviRules 2.22, it works. On CiviRules 2.23 it doesn't, since array indexes are capitalized differently.