I feel sorry for everyone having these HD vs 4K issues with iTunes. I only remember having purchased two movies via iTunes...ever...over the course of many years. Yet iTunes on my Apple TV 4K lists 8 movies as purchased and 4 of them are 4K. I’ll never watch them there, so they are useless to me. All of them are already in my Plex library. Still...pretty odd.
LG OLED65C7P - Professionally Calibrated l Apple TV 4K l Microsoft Xbox One S l Sony STR-ZA1100ES l Polk Audio CS2 Series II Center Channel l Polk Audio Monitor 60 Series II Floorstanding L/R l Polk Audio Monitor 45B Rear Surround l Dual BIC V1220 Subwoofers