If the ma'mum misses the first tashahhud because he did not hear the imam, what is required of the imam and the ma'mum?

Question:
May Allah keep you safe, Your Eminence, father. The questioner says: When the ma'mum do not hear the takbir for the first tashahhud, and they remain in prostration until the imam stands up for the third rak'ah, and they did not sit for the first tashahhud, what is required of the ma'mum, and what is required of the imam?

Answer:
The imam owes nothing because he did not leave anything out. But the important thing is that he left out the first tashahhud; he follows the imam and prostrates for the rak'ah.