skinparam stereotypeCBackgroundColor isn't applied

Question

got some questions so far on class diagrams

@startuml
skinparam class {
    BackgroundColor PaleGreen
    ArrowColor SeaGreen
    BorderColor SpringGreen

    BackgroundColor<<metaclass>> Wheat
    BorderColor<<metaclass>> Tomato
    ArrowColor<<metaclass>> Red
}

skinparam stereotypeCBackgroundColor Red
skinparam stereotypeCBackgroundColor<<metaclass>> DimGray
skinparam spotChar Z
skinparam spotChar<<metaclass>> M

class meta <<metaclass>>
class mcls <<metaclass>>
meta "1" *-- "many" Class02 : contains
mcls o-- Class04 : aggregation
@enduml

questions

1. skinparam spotChar Z - is it possible to change spotChar for class / interface / annotation type somehow?
2. also, skinparam stereotypeCBackgroundColor Red and skinparam stereotypeCBackgroundColor<<metaclass>> DimGray aren't applied despite they should (since official reference has this sample working)

Comments

See also answers or comments on:

• https://forum.plantuml.net/16550/stereotype-char-and-char-background-color-for-class-diagrams