1. Should {{ }} block honor parent's block includes, or should I put !include into the {{}} block explicitly again?
Neither of the above work.
@startuml
!include skins.iuml /' this is not honored in the {{ }} block below '/
a->b: test
note right
{{
!include skins.iuml /' *** this line is not evaluated as well '/
c->d
note right
test
end note
}}
end note
@enduml
2. additionally {{}} block does not honor the output format (if the parent is in svg format, the child {{}} will be generated as png)