Prayer: If unaware of Imam Khomeini’s ruling on Tehran as a large city, are past prayers and fasts still valid?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: If unaware of Imam Khomeini’s ruling on Tehran as a large city, are past prayers and fasts still valid?

English:

Question #704:

Until the Revolution a person had no knowledge of Imam Khomeini’s (q.) verdict considering Tehran as a large city. What rule will apply to the prayers and fasts that he had performed in the usual way?

Answer #704:

If he continues to do taqlīd of the late Imam (q.) concerning this issue, it will be obligatory for him to repeat the past acts which did not conform to his verdict, by making the qaḍā’, in shortened form, of the prayers performed in full while his duty was to shorten them, and making the qaḍā’ of the fasts kept while he was a traveler. However, he may refer to a living mujtahid in this issue in which case there is no need to repeat the past prayers.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer