Skinparam FontColor for package is ignored

[kiwaa]

JS version does not respect packageFontColor and packageStereotypeFontColor (both still could be seen)

https://plantuml.github.io/plantuml-core/raw.html?ROun3i8m34NtdC8ZY2jKbKgbJWmCNC1DJ5KLuiXnXWZbxeIA2J9uUUzP-d5RVK319mIq6oxKTHVCdBJluMK0PXP7ClA31Mw2FjQOl7vCxHVXv5tBJkornQEI46iEr2wACTyXWF2pPVNr-OwMO9YZ2bgTwh7atPvW54Abgx1BLeV3yH-UTrXCUGC0

@startuml
skinparam package<<Layout>> {
  borderColor Transparent
  backgroundColor Transparent
  FontColor Transparent
  stereotypeFontColor Transparent
}

package a <<Layout>> {
  interface AbstractFactory {
  + CreateProductA()
  + CreateProductB()
  }
}
@enduml

Expected:
None of package elements are visible
Actual:
Package name and stereotype are visible