1. Create pipeline in version X of CDAP (6.1.x)
2. Upgrade sandbox/cluster to be Y (CDAP 6.1.x+1 or 6.2)
3. Go to pipeline drafts and edit
After step 3 the UI shows an empty pipeline canvas. We should be going through the upgrade flow just as how we do while importing a pipeline.
Unsupported pipelines in drafts would be upgraded when users open them.