According to the words of a Daoist Fruit Realm from Cloud's End, cultivators who enter the mist, from Heavenly Sovereigns to Immortal Monarchs, because they are not cultivators from Ashen Mountain, even if they complete their tasks and obtain battle achievements, cannot pass through.
To Han Yi, this sounded like a program bug; the normal process should involve completing a task, adding one to the battle achievements, and once a certain number is reached, passing the assessment. Then, irrespective of whether one receives an inheritance, they should not have to restart reincarnation.
However, the current situation is such that after completing the task and obtaining battle achievements, these should be added to the person undertaking the task. But the entity supporting the inheritance discovers it cannot query the task person because they are not listed as a cultivator of Ashen Mountain, thus creating a 'bug' in the program and resetting them to the initial stage.