Laravel: Why does eager loading only keep results for last model?

If I execute the following:

App\Assignment::with(['unit.records' => function ($q) {
                    $q->where('process_date', '>=', '2016-01-01')
                        ->where('process_date', '<=', '2018-09-27')
                        ->orderBy('process_date')
                        ->orderBy('process_hour')
                        ->limit(1);
                    }])
                    ->whereIn('id', [9])
                    ->get();

Then I get the following result:

Illuminate\Database\Eloquent\Collection {#1104
 all: [
   App\Assignment {#1112
     id: 9,
     unit_id: 6,
     start_date: "2015-11-25",
     end_date: "2016-01-04",
     unit: App\Unit {#986
       id: 6,
       records: Illuminate\Database\Eloquent\Collection {#945
         all: [
           App\Record {#853
             id: 6624,
             unit_id: 6,
             process_date: "2017-09-19",
             process_hour: 14,
           },
         ],
       },
     },
   },
 ],
}

Note how the loaded unit has a record that matches the query.

Now, if I use the exact same query but add another assignment (49) to my whereIn array:

App\Assignment::with(['unit.records' => function ($q) {
                    $q->where('process_date', '>=', '2016-01-01')
                        ->where('process_date', '<=', '2018-09-27')
                        ->orderBy('process_date')
                        ->orderBy('process_hour')
                        ->limit(1);
                    }])
                    ->whereIn('id', [9,49])
                    ->get();

The record for assignment 49 is shown, but the record for assignment 9 does not show up anymore:

Illuminate\Database\Eloquent\Collection {#1032
 all: [
   App\Assignment {#1014
     id: 9,
     unit_id: 6,
     start_date: "2015-11-25",
     end_date: "2016-01-04",
     unit: App\Unit {#1283
       id: 6,
       records: Illuminate\Database\Eloquent\Collection {#1254
         all: [],
       },
     },
   },
   App\Assignment {#1061
     id: 49,
     unit_id: 29,
     start_date: "2017-02-24",
     end_date: "9999-12-31",
     unit: App\Unit {#1279
       id: 29,
       records: Illuminate\Database\Eloquent\Collection {#1131
         all: [
           App\Record {#1284
             id: 6062,
             unit_id: 29,
             process_date: "2017-03-10",
             process_hour: 13,
           },
         ],
       },
     },
   },
 ],
}

The record that matches the criteria for assignment 9 obviously exists, but for some reason it doesn't get loaded when the query finds more than one assignment with a unit/record that matches the criteria.

I tested this with more assignments as well, and in each case the record will only show up for the last assignment in the array.

What's the deal here?

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