I want to show a tree  with edge labels. I tried out

G1 = Graph({1:{5:0},2:{5:1},3:{6:1},4:{7:0},5:{6:0},6:{7:1}})
show(G1,edge_labels=true)
show(G1,layout="tree",edge_labels=true)

In the first graphic the labels are positioned on the edges but in the
second one they are not. Why is this? How can I get it right?

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