My apple movie library is reaching almost 900 titles. I accidentally purchased a duplicate title back in December without referencing my library list. Thankfully it was only a $4-$7 title but it messes with my OCD to have identical movies. I understand if studio licensing changes and the other copy becomes obsolete to “buy”. I have suggested apple add an Apple TV system enhancement to provide a notice if a suspected duplicate title is about to be purchased. I have seen this notification pop up if you attempt to purchase a movie bundle with a title you already own. This notice allows you to either continue with the purchase or not. I dont understand why they cannot add this simple enhancement feature if studio licensing changes on a title.
I had this happen when I bought a bundle before. Like you, I have like 800 or so movies. I thought it would be like a tv season and not give me the things I already had. That was not the case. I removed it just like you said.