Seconds scalar not working

[asawatzki]

Hi folks, I'm trying to pass an int value as seconds scalar to my graphql-backend.

My mutation looks like

updateS(
  sId: ID = null
  s: s = null
): SType

My input type s looks like

type s {
  s: Seconds = null
}

And my SType looks like

type SType {
  s: Seconds
}

Example call (via playground)

mutation {
  updateS(s: "08d924e8-69fb-425c-8130-de7342a2ca2a", s: {
    s: 3600
  }) {
    s
  }
}

This is the payload from chrome when I call the mutation in my vue-app:

{"operationName":"updateS","variables":{"sId":"08d924e8-69fb-425c-8130-de7342a2ca2a","s":{"s":3600}},"query":"mutation updateS($sId: ID!, $s: s!) {\n  updateS(sId: $sId, s: $s) {\n   s\n__typename\n  }\n}\n"}

When I call the mutation via playground, everything works fine. Neither does my vue app throw any error/exception nor works the mutation. The mutation is called in the backend, but the value for s is null (and so 00:00:00 as it is a TimeSpan). The backend is written in dotnet core 3.1 but as I said the convertion from a given number to TimeSpanSecondsGraphType works via playground. Any suggestion?

Thanks in advance!