Important

PlantUML v2.12.0: Layouts may change with this bugfix.
When LAYOUT_LANDSCAPE() is combined with Lay_*() calls, elements are now positioned correctly based on the new implementation.
Previously, the implementation swapped up/left and down/right (see issue 376).
To restore the old behavior, set !NO_LAY_ROTATE=1. For more details, see Compatibility mode NO_LAY_ROTATE=1.

@startuml 
' the bugfix can be deactivated with following statement
' !NO_LAY_ROTATE = 1
!include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Container.puml
LAYOUT_LANDSCAPE()
Person(a, "A")
System(sUp, "B up\nbefore bugfix left")
System(sRight, "C right\nbefore bugfix down")
System(sDown, "D down\nbefore bugfix right")
System(sLeft, "E left\nbefore bugfix up")
Lay_U(a, sUp)
Lay_R(a, sRight)
Lay_D(a, sDown)
Lay_L(a, sLeft)
HIDE_STEREOTYPE()
@enduml