Is combining prayers due to rain or the imam's mistake in prayer considered a break in maintaining the takbirat al-ihram for forty days?

The hadith, "Whoever prays to Allah for forty days in congregation, catching the first takbeer, will be granted two absolutions: absolution from hellfire and absolution from hypocrisy," is considered weak by Al-Tirmidhi and a group of scholars, although some later scholars deemed it hasan (good). If the people of the mosque combine two prayers, or if the worshipper (whether imam or congregant) makes a mistake in his prayer, that does not exclude him from having caught the first takbeer.