Currently, the only way for allowing users to delete scheduled transitions, the administer scheduled transitions permission has to be given. This also gives access to the scheduled transitions settings form, which is not always the desired behavior.
Just as there are per entity type & bundle permissions for "view" and "add" operations, I think it would be logical to provide the same for "delete" operations.
Needs work
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Added a patch here to update the hook update number so it applies to 2.4.x
Had an error:
Error: Call to undefined method Drupal\node\Entity\Node::isProcessed() in Drupal\scheduled_transitions\ScheduledTransitionsAccessControlHandler->checkAccess() (line 55 of /app/web/modules/contrib/scheduled_transitions/src/ScheduledTransitionsAccessControlHandler.php).
Fixed it in the latest patch (see interdiff).