Pagination with join table not working getting duplicate value with groupBy or unique() or distinct().

Pagination with multiple tables joined not working to get the unique value in the query and only working with get() method. I have also orderBy in the query. Unique value is not achieved and in the example below using unique with paginate i am getting 5 unique items and with get i am getting 9 unique items and while using groupby and distinct no unique selected values are found. It will be difficult if we have large data so how to achieve it.

//Code 1
//Working properly with get method
Model::join('table_A', 'table_B.id', '=', 'table_A.id')
                ->select([table_A.title', 'table_A.category_id', 'table_B.item', ])
                ->orderBy('table_A.created_at', 'desc')
	->unique('item')
    ->get();

//Code 2
//Not Working with paginate & ->groupBy //No unique with this query
Model::join('table_A', 'table_B.id', '=', 'table_A.id')
                ->select([table_A.title', 'table_A.category_id', 'table_B.item', ])
                ->orderBy('table_A.created_at', 'desc')
    ->groupBy('table_B.item')
    ->paginate();

//Code 3
 // Not Working with paginate & ->distinct //No unique with this query
Model::join('table_A', 'table_B.id', '=', 'table_A.id')
                ->select([table_A.title', 'table_A.category_id', 'table_B.item', ])
                ->orderBy('table_A.created_at', 'desc')
	->distinct('item')
    ->paginate();

//Code 4
// Not Working properly with paginate & ->unique. In this example i am getting 9 unique value when using get() and when using paginate 5 unique value are achived.
Model::join('table_A', 'table_B.id', '=', 'table_A.id')
                ->select([table_A.title', 'table_A.category_id', 'table_B.item', ])
                ->orderBy('table_A.created_at', 'desc')
	->unique('item')
    ->paginate();