Must the worshipper who prayed Maghrib facing the wrong Qibla out of forgetfulness, and became aware of that during the 'Ishā prayer, repeat the Maghrib prayer?

For the prayer to be valid, facing the Qibla (definition) is a condition. If one prays facing other than the Qibla—whether intentionally or forgetfully—while being able to face it, their prayer is invalid, and they must repeat it, due to the Almighty's saying: (So turn your face toward Al-Masjid Al-Haram (definition)) and the Prophet’s (peace be upon him) saying: (Then face the Qibla and say Allahu Akbar).