Does pronouncing "Al-Mustaqīm" with a kasra on the mīm instead of a damma invalidate the prayer if done out of ignorance, and does that change the meaning?

The "Meem" in the word "Al-Mustaqeem" in Surat Al-Fatihah is pronounced with a fatḥah ( ‫َ ) when connected [to the next word], and not with a kasrah ( ‫ِ ) or a ḍammah ( ‫ُ ). Changing its diacritical mark to a kasrah or a ḍammah is considered a clear, impermissible error (laḥn jalī). However, the prayer is not invalidated by it as long as the meaning does not change, similar to the errors in "Maliki Yawm Ad-Deen" or "Na'budu."