What is the ruling if one recognizes error in their Qibla estimation but cannot determine the correct direction?

Primary text

If error is apparent but the person cannot ascertain the direction of the Qibla—for instance, if they estimated a direction based on lunar positions but are unsure whether they are facing east or west, necessitating renewed Ijtihad—the prayer becomes invalid. This is because the prayer cannot be continued toward a direction other than the Qibla, and since there is no established direction to face, the prayer is invalidated due to the impossibility of its completion.