Moving fields around in GraphQL query creates a error | Payload | Page 1

Hey, I have the following graphql query:

query {
            Posts(where: {slug: {equals: "${slug}"}}, limit: 1) {
                docs {
                    keyword
                    slug
                    question
                    question_context
                    answer
                    description
                    categories
                    ready
                    concepts {
                        slug
                        question
                        explanation
                    }
                    related { <=== This is a Post (relation)
                        question
                        ready <===== moving this on top creates a error, see below output
                        slug
                    }
                    short_answer
                    updatedAt
                }
            }
        }

I was debugging the issue concerning graphql request and realised that moving field ready from top to second row resolves the issue. What is strange is that it is happening only in the product build , not in dev 3.0.0-beta.70. Why is that happening?

Error:
https://pastebin.com/XRtjKrHq

"errors": [
      {
        "extensions": {
          "name": "Error",
          "statusCode": 500
        },
        "locations": [
          {
            "line": 18,
            "column": 21
          }
        ],
        "message": "Something went wrong.",
        "path": [
          "Posts",
          "docs",
          0,
          "related",
          1
        ]
      }
    ],
    "status": 200,
    "headers": {}

Pastebin

[Error]: Something went wrong.: {"response":{"data":{"Posts":{"doc...

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#Moving fields around in GraphQL query creates a error

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