The parameters that are not present in source file are shown the diagram.

The similar issue may be present also in other icons.

"stateDataFilter" may contain "input" and "output", for example:

"stateDataFilter": {
      "input": "${ {fruits: .fruits} }",
      "output": "${ .provisionedOrders }"
  },

These parameters are not mandatory. If you remove any of them, there are still both parameters shown in the diagram:

"stateDataFilter": {      
 },

Expected outcome

The parameters that are not defined in the source file are not shown in the diagram.