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Question: Is style = planar option of DrawGraph failure when some graphs are planar ?

Question:Is style = planar option of DrawGraph failure when some graphs are planar ?

lcz 1039 Maple 2019
graphtheory drawgraph
February 03 2020
1

   It would seem that the option style = planar  of DrawGraph()    is  failure when some graphs are planar.
   For example: 

treeof5:=[NonIsomorphicGraphs(5,4,output= graphs,outputform=graph,restrictto = connected )]:
DrawGraph ~ (treeof5, stylesheet=[vertexborder=false,vertexpadding=20]);

 

We know tree is planar graph obviously. But when I add the option style = planar ,  drawing of the first tree of list displays an error :
Error, (in GraphTheory:-Graph) vertex 1 cannot be its own neighbour in list of neighbours

I did not find any reason to explain. 
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