Must a person who changed their Qibla direction based on Ijtihad and then changed it again repeat the previously performed prayer sections?

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If the direction of prayer changes based on new Ijtihad, the worshipper turns toward the new direction and builds upon the prayer already performed. This is not considered overturning Ijtihad; rather, the changed direction is only implemented for the future, similar to how a subsequent prayer is treated. An overturning of Ijtihad would only occur if the worshipper were required to repeat the past parts of the prayer as if they had never occurred.