Is it prescribed to interrupt the prayer and send blessings upon the Prophet during the first tashahhud and then follow the Imam if he says the takbir to move to the third rak'ah?

It has been previously explained that invoking blessings upon the Prophet, peace and blessings be upon him, in the first tashahhud is not a pillar, nor an obligation, nor even recommended according to many scholars, and this is the most preponderant opinion. However, performing it does not invalidate the prayer, even if done intentionally, because it is a prescribed remembrance performed in an improper place. Therefore, it is not recommended for the questioner to perform it, and if he begins to recite it and the imam stands, he should cut off his recitation and follow the imam.