ortho linetype with class diagrams with labels on arrows from class calling itself

Question

Following code :

@startuml
skinparam linetype ortho
skinparam pathHoverColor black
class A
class B
A --> A [[{L1}]]: L1
A --> B [[{L2}]]: L2
@enduml

Gives :

Label on A --> A : L1 is not shown. However, its available on mouse over.