Inconsistent Workflow Definition-Workflow version

Good day all.

We're facing "Inconsistent workflow definition: Node/step number 1 is not available".

We're trying to restart the workflow but unsuccessfull.

Based on our investigation it seems that this is due some error in older version.

Unfortunatelly "generate and activate runtime version" button is not active in our production system.

We fixed this older version in development system, we activated and transported into production system. But I'm wondering why our production system generate new version of workflow istead of replacing and activating the older version.

I'm looking forward somebody can give me an explanation on this.