Wrong relative port position

[uruuru]

In the graph below, p1 is positioned wrongly. Its y-coordinate within the drawing is larger than the 30 specified in the model.
I couldn't observe the behavior in the eclipse context.

The graph:

algorithm: org.eclipse.elk.fixed

node n0 {
    elk.^position: "(10.0,60.0)"
}

node n1 {
    elk.^position: "(70, 50)"
    algorithm: org.eclipse.elk.fixed
    port p1 {
        layout [ size: 5,5  position: 0, 30]
    }
    node inner1 {
        elk.^position: "(20.0, 20.0)"
        algorithm: org.eclipse.elk.fixed

        node inner2 {
            layout [ size: 30, 30]
            algorithm: org.eclipse.elk.fixed
            elk.^position: "(30.0, 30.0)"
        }
        edge inner1 -> inner2 {
            elk.bendPoints: "(0, 30), (10, 30), (10, 45), (20, 45)"
        }
    }
    edge n1.p1 -> n1.inner1 {
        elk.bendPoints: "(0, 60), (10, 60), (10, 70), (20, 70)"
    }
}

edge n0 -> n1 {
    elk.bendPoints: "(40, 70), (60, 70), (60, 90), (70, 90)"
}