Example #6 renders inconsistently

[grevian]

https://graphs.grevian.org/example#example-6 sometimes renders as expected, sometimes renders looking slightly different, and sometimes fails entirely to render

This may be a problem with https://github.com/grevian/graphviz-renderer-web or its dependency https://github.com/goccy/go-graphviz, The behaviour also seems "sticky" once it fails, which could be related to caching?

Expected:

Actual: