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The output svg format changes with graphviz 2.40 and the GUI (left part with rewriting history) is broken. Attached the output of the two versions on the same input:

digraph G {
    node [fontname=Arial];
    ranksep=0.01;
    nodesep=0.04
    node_mod_0_0 [label="", fontcolor=transparent, color=transparent]
    node_mod_0 [label="init"]
    {rank=same; G0; node_mod_0_0}
    node_mod_0_0 -> G0 [color=transparent]
    node_mod_0_0 -> node_mod_0 [color=transparent]
    G0 [shape=box, label="G0", style=filled, fillcolor="#35FF5C"]
    node_mod_1_0 [label="", fontcolor=transparent, color=transparent]
    node_mod_1 [label="##end##", fontcolor=transparent, color=transparent]
    {rank=same; G1; node_mod_1_0}
    node_mod_1_0 -> G1 [color=transparent]
    node_mod_1_0 -> node_mod_1 [color=transparent]
    node_mod_0 -> node_mod_1_0 [color=transparent]
    G1 [shape=box, label="G1", style=filled, fillcolor="#FF3E47", peripheries=2]
    G0 -> G1
{rank=same; G1; node_mod_1_0}
}