Banished lord's talisman has bug with imprisoned spirit's aspect

When using Banished Lord’s talisman, if the first bone sprit damage is applied as overpower, the second damage caused by impisoned spirit’s aspect is also applied as overpower. However, if you use the next bone soul skill before the second damage is done because the attack speed is too fast, the second damage of the bone spirit before is not applied as overpower. This doesn’t happen when the attack is slow, but when the attack speed is fast, this is obviously an unintended bug.