Hi,
In this first example, all is fine.
@startuml Without stereotype
skinparam ArrowThickness 5
component toto
component tutu
toto -> tutu <<mystereotype>> : Foo
@enduml
But if I use stereotype, my personalisation is lost.
@startuml With stereotype
skinparam ArrowThickness<<mystereotype>> 5
component toto
component tutu
toto -> tutu <<mystereotype>> : Foo
@enduml
My version : 1.2021.7
Regards,