Code gen doesn't generate client queries when queries are defined in a schema block

My GraphQL server generates a GraphQL schema and I'm trying to use that schema to generate the client with the code gen. In the auto-generated schema queries are defined in a schema block:

schema {
   query: MyQuery
}

type MyQuery {
   MyObjects: [MyObject]
}

When I run the code gen the query MyObjects isn't detected and the code for the query isn't generated. When I change type MyQuery to type Query it works fine but I can't change the definition on the server side and I don't want to make any changes in the auto-generated schema.
Do I have to configure the code gen to detect queries defined in a schema block or is this feature unsupported at the moment?

Start by reproducing the issue with the schema block and named root type shown in the report, then trace how code generation identifies query types. Done means the generated client includes code for the MyObjects query without changing the schema; no specific files or tests are named in the report.