GraphQL deleteExtension for a virtual extension returns 400 Bad Request

Using the GraphQL API to attempt to delete a virtual extension results in a 400 Bad Request.

 Verified on most recently stables module:

• Core 15.0.22.9
• Framework 15.0.23.11
• PBX API 15.0.8

 Example mutation:

    mutation {
        deleteExtension(
            input: { extensionId: 540 }
        ) {
            status
            message
      }
    }