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That was being discussed in these threads: https://www.hometheaterforum.com/community/threads/why-panavision-aspect-ratios-for-tv-shows.368525/ https://www.hometheaterforum.com/community/threads/what-is-it-about-the-1-66-1-ratio-that-i-love-so-much.368470/

Most likely a rights issue - things disappear pretty regularly from iTunes, only to reappear later. I doubt it would have anything to do with a remaster. SD masters are frequently replaced by HD ones, and HD by 4K, without the title ever being pulled from sale or rental.