The Shafi'i Prayer Behind the Hanafi

Question
If a Shafi'i prays behind a Hanafi and the Hanafi does not recite the Basmala, is the Shafi'i's prayer invalid? And conversely, if a Hanafi prays behind a Shafi'i and the Shafi'i loudly recites the Basmala, is the Hanafi's prayer valid, or is the rule that if his prayer is valid according to his school, then his prayer behind him is valid even if it contradicts his school?
Answer
I say, and with God's success: Such disagreements between the schools of thought do not harm the prayer of the follower, and it remains valid, and God knows best.
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