Thanks for the report.
This has been fixed in last beta
http://beta.plantuml.net/plantuml.jar
See for example
http://www.plantuml.com/plantuml/umla/SoWkIImggKpCpU5wtDXKL9fPOgNWM52GamhY5cTMfLef-2GMfOEvoVav-KLM2a6fALmEgNaf84q0
Note that there might be some cache issue with the online server.
Tell us if you find other issues!