Must a person who fasted 29 days between his home country and Saudi Arabia make up a day, given that Muslims in both countries completed 30 days, or is his fasting of 29 days sufficient?

If a Muslim fasts 29 days, he is not required to make up any fasts, because a month can be 29 or 30 days. However, he must refrain from eating for the rest of his day if he finds the people of his country fasting. So, whoever travels from a country where the crescent moon was not sighted to a country where it was sighted, celebrates Eid with them. If he fasted 28 days, he must make up one day. But if he fasted 29 days, he does not have to make up any fasts. And whoever wakes up celebrating Eid, then his ship travels to a town whose people are fasting, the correct view is that he should refrain from eating for the rest of the day.