Arrow originating from nowhere in nested ifs in new activity diagram

Question

Trying this:

@startuml
start
if (?) then (1)
    :Something;
else (2)
    if (?) then (x)
        stop
    else (y)
        stop
    endif
endif
stop
@enduml

Results in an arrow originating from no node, somewhere below and  between the two stops of the inner IF, going to the bottom stop node.

Answer 1

Seems OK on newer versions of PlantUML.