newpage not working for state diagrams

[Shoggomo]

The newpage keyword is not working when used for state diagrams. Nothing about this behaviour is noted in the language reference.
If this is intended behaviour, this should be added to the reference.

Example:
This does not work.

@startuml
[*] --> State1
State1 -> State2
newpage
State3 -> State4
@enduml

When commenting out newpage it works.

@startuml
[*] --> State1
State1 -> State2
'newpage
State3 -> State4
@enduml