Hi all!
I got strange renderings with my new Ubuntu 19.04.
A simple diagram like this:
@startuml test
state superstate {
state mystate
}
[*] --> mystate
mystate --> [*]
@enduml
is rendered like this:

on my machine the output is

Anyone is experiencing the same issue? Any clues? Should I submit a bug?
- PlantUML Version 1.2018.13, also tried 1.2019.05
- dot - graphviz version 2.40.1 (20161225.0304)