How can I have created data (id) returned for a GraphQL mutation? I have a mutation which is successfully creating an entry, but the data returned for the mutation does not include the fields I specify, such as id.
mutation saveWindowCleaningRequest($title: String!, $frontendInput: String!) {
  save_pdWindowCleaningRequests_pdWindowCleaningRequests_Entry(title: $title, siteId: 2, frontendInput: $frontendInput, authorId: 1) {
    id
    title
    ... on pdWindowCleaningRequests_pdWindowCleaningRequests_Entry {
      frontendInput
    }
  }
}

Data returned:
{
  &quot;data&quot;: {
    &quot;save_pdWindowCleaningRequests_pdWindowCleaningRequests_Entry&quot;: null
  }
}

Mutation result screenshot:

Subsequent entry query result screenshot, showing entry was created:

I'm running Craft 3.5.15.1 with PostgreSQL 12.4 in Ubuntu 18.04.5 LTS.
As noted by yvanavermaet in the comments on the question, this is an issue with Craft. It's been fixed in 3.6.5.
Thanks!