What is the ruling on لحن (lahan, i.e., grammatical or a pronunciation error) in Al-Fatiha during prayer?

Errors in reciting Al-Fatiha invalidate the prayer if done intentionally, or if the reciter is capable of learning but has not learned. However, if the error is due to forgetfulness or if the reciter is incapable of learning, their prayer is valid.

Whoever intentionally makes an error, their prayer and the prayer of anyone who follows them are invalid, because they have introduced an extraneous word. However, whoever makes an error due to forgetfulness, their prayer is not invalidated.

Whoever makes an error due to incapacity and cannot be taught, their prayer and the prayer of anyone who follows them are valid. However, whoever is incapacitated due to lack of time or the absence of a teacher, despite being capable of learning, their prayer and the prayer of anyone who follows them are invalid if there is someone following them. If there is no one following them, their prayer and the prayer of anyone who follows them are valid if the follower is similar to them.