The CMMN case models don’t have a Version Tag attribute in the XML and exposed in the modeler as BPMN and DMN models do. This is per v2.2.3 of the modeler, released last Friday.
Is there a valid reason for this, or is it something that just hasn’t been implemented yet and is on the roadmap?
Just something that hasn’t been implemented and as far as i know isn’t on the roadmap.
If you like you can create a Feature request for it: https://app.camunda.com/jira