It looks like a recent ComfyUI update has broken how the primitive string for the prompt is passed into the subgraph in the v4.0 workflow. I'll try to fix this as soon as I can.
This is a simple workflow with refiner for the GonzaLomo and MoP SDXL models.
Description
This workflow works with my v4.0 Unity XL Non-DMD model, basically refining the initial generation with higher detail using my DMD model.