When loading a graph with a subgraph having attributes, the first node of the subgraph does not load correclty its attributes.
When showing the attributes it appears empty.

The graph used is as follows:
digraph g {
subgraph cluster_0 {
label="p0";
n0 [stateAvg=1];
n1 [stateAvg=0.57906];
n2 [stateAvg=0.63874];
n3 [stateAvg=0.56205];
n4 [stateAvg=0.61574];
n5 [stateAvg=0.57295];
n6 [stateAvg=0.58893];
n7 [stateAvg=0.57386];
n8 [stateAvg=0.64304];
n9 [stateAvg=0.61665];
n10 [stateAvg=0.56415];
n11 [stateAvg=0.57813];
n12 [stateAvg=0.58567];
n13 [stateAvg=0.5686];
n14 [stateAvg=0.5705];
n15 [stateAvg=0.56554];
n16 [stateAvg=0.57735];
n17 [stateAvg=0.56387];
n18 [stateAvg=0.58023];
n19 [stateAvg=0.5623];
}

n0 -> n2;
n0 -> n8;
n0 -> n9;
n1 -> n17;
n1 -> n18;
n1 -> n2;
n1 -> n3;
n1 -> n7;
n1 -> n9;
n1 -> n11;
n2 -> n0;
n2 -> n1;
n2 -> n18;
n2 -> n4;
n2 -> n6;
n2 -> n7;
n3 -> n1;
n3 -> n13;
n3 -> n17;
n3 -> n5;
n4 -> n2;
n4 -> n8;
n4 -> n9;
n5 -> n17;
n5 -> n3;
n5 -> n8;
n5 -> n10;
n6 -> n12;
n6 -> n2;
n6 -> n11;
n7 -> n1;
n7 -> n12;
n7 -> n13;
n7 -> n15;
n7 -> n19;
n7 -> n2;
n7 -> n9;
n7 -> n10;
n8 -> n0;
n8 -> n12;
n8 -> n16;
n8 -> n4;
n8 -> n5;
n8 -> n9;
n9 -> n0;
n9 -> n1;
n9 -> n13;
n9 -> n14;
n9 -> n18;
n9 -> n4;
n9 -> n7;
n9 -> n8;
n9 -> n11;
n10 -> n14;
n10 -> n5;
n10 -> n7;
n11 -> n1;
n11 -> n13;
n11 -> n18;
n11 -> n6;
n11 -> n9;
n12 -> n6;
n12 -> n7;
n12 -> n8;
n13 -> n16;
n13 -> n17;
n13 -> n19;
n13 -> n3;
n13 -> n7;
n13 -> n9;
n13 -> n11;
n14 -> n19;
n14 -> n9;
n14 -> n10;
n15 -> n18;
n15 -> n7;
n16 -> n13;
n16 -> n17;
n16 -> n8;
n17 -> n1;
n17 -> n13;
n17 -> n16;
n17 -> n18;
n17 -> n3;
n17 -> n5;
n18 -> n1;
n18 -> n15;
n18 -> n17;
n18 -> n2;
n18 -> n9;
n18 -> n11;
n19 -> n13;
n19 -> n14;
n19 -> n7;
}