8.2 task search provider-acceptedByCurrent attribute

We have a project which is implemented in 8.0 and we are upgrading it to 8.2. We have a problem with table with which binding task search provider in inbox result.We are setting acceptedByCurrent attribute of serach query of task search provider as false.We are expecting not to see the records which is accepted by current user in the table. But it is not working properly even if the acceptedByCurrent attribute value is false. The task is accepted by current but still in the table.