When using the Get Flow and Create Flow connectors, you cannot modify the JSON contained in "Flow Definition" dynamic content that you use with the Create Flow connector. Please allow the "Flow Definition" to be updated.
For example I have a flow that gets triggered when a document library gets updated. I want to copy that flow and apply it do a different document library, so I would like to do this.
1) Use "Get Flow" to get the flow I want to copy
2) Update the JSON metadata from the "Flow Definition" dynamic content returned from "Get Flow", so that it points to a different document library
3) Use "Create Flow" to create a new flow based on the updated JSON metadata in step 2)