Dataflow Activity Parameters Lose Expression and Get Hardcoded After Reopening Pipeline

[svac]

Hi! I’m using a Dataflow Gen2 activity in a Fabric pipeline and passing parameters via dynamic content (pipeline library variables).

When I configure the parameters, they are correctly stored as expressions:

"value": {

"value":

"@pipeline().libraryVariables.Data_engineering_Variable_Library_workspace_id",

"type": "Expression"

}

The pipeline validates and saves successfully. However, when I reopen the pipeline, Fabric rewrites the parameter values as evaluated static string:

"value": "f31c2823-10f1-4e97-bc15-6f39f4981d57",

"type": "String"

This removes the expression and effectively hardcodes the value.

• Is there a supported way to persist dynamic expressions for Dataflow Gen2 parameters in pipeline activities?
• Are there recommended patterns for passing workspaceId/lakehouseId dynamically without the UI flattening expressions?

Thanks!!