Problem with node position when using obsidian appearance

[binsee]

When using the obsidian appearance, if there are more than 8 child nodes under the node, some of the child nodes will be located on the line between other nodes.
This problem does not occur with the default style.

When there are 9 child nodes

When there are many child nodes

[tchayen]

@dobrovolsky What do you think about it? I don't remember exactly your parameters of simulation and I haven't used obsidian much, so I have no idea if it is unfortunate, but correct behaviour or indeed an issue.