I add swimlane in label example like
@startuml
title Point two queries to same activity\nwith `goto`
|test|
start
if (Test Question?) then (yes)
'space label only for alignment
label sp_lab0
label sp_lab1
'real label
label lab
:shared;
else (no)
if (Second Test Question?) then (yes)
label sp_lab2
goto sp_lab1
else
:nonShared;
endif
endif
|test1|
:merge;
@enduml
then label doesnt work.