One 'interface with sprite & text' on its own doesn't draw very well:
@startuml
interface #white "long text" as A <<$archimate/principle-filled>>
@enduml
However, two of them together draw perfectly!
@startuml
interface #white "long text" as A <<$archimate/principle-filled>>
interface #white "long text" as B <<$archimate/principle-filled>>
@enduml