too long

I'm having a weird problem, using Laravel 5.3

Here's a small snippet of my validation

$validator = Validator::make($request->all(), [
        'item_rows.*.imei' => 'unique:t_inventory_imei,imei_barcode,NULL,id,status,'."A",
        'item_rows.*.quantity' => 'required|numeric|not_in:0',
        'item_rows.*.cost_price' => 'required|numeric|not_in:0',
        'item_rows.*.id_inventory' => 'required|numeric|not_in:0',
        'item_rows.*.id_branch' => 'required|numeric|not_in:0',
        'item_rows.*.id_branch_location' => 'required|numeric|not_in:0',
        'ref_document_no' => 'required',
        'ref_doc_date' => 'required|date',
      ]);

Problem comes when unique:t_inventory_imei,imei_barcode,NULL,id,status,."A" this rule is available.

This rule doesn't seem to be validated, it will effect the last rule to be validation error, say returning {"message":"validation_fail","validation_error":{"currentRule":"date"}}

If I remove the last row, it will cascade up and so on {"message":"validation_fail","validation_error":{"currentRule":"required"}}

If I remove every rule leaving only the first unique rule, the validation works, it is able to detect unique row with rule status A.

Is this a bug from Laravel or is there something wrong with the code?