Common module flow ref 400 error

Stuck on common module refs. here’s the node config:

{ "ref": "cm-uuid", "type": "flow" }

POST /api/v2/architect/flows throws 400. error says CircularDependencyDetected but this is a leaf node calling a shared flow. tried version pinning too. swapped ref for flowRef and the validator choked on unknown field. payload shape for cross-flow calls isn’t documented properly.