Query by doubly-nested attribute returns matching record 3 times instead of once

## Problem

Querying by a doubly-nested attribute path (e.g., `related.subObject.any`) returns the correct matching record but duplicates it 3 times. Affects both GraphQL and REST.

```graphql
{ SubObject(related: { subObject: { any: "any-3" } }) { id any } }
# → returns id:"3" three times
```

```
GET /SubObject/?related.subObject.any==any-2&select(id,any)
# → returns id:"2" three times
```

🤖 Filed by Claude on behalf of Kris.