Alright, finally got around to testing quite a few more movies and here are the ones I found that are still only available in 720p:
Justice League x RWBY part 1 - available in 1080p but not 4k?; Part 2 only available in 720p
X-Men Origin: Wolverine
Hollywood Homocide
Machete
Machete Kills
Once upon a time in China
Once upon a time in China II
Once upon a time in China III
Paul Blart Mall Cop
Paul Blart Mall Cop 2
Robocop (2014)
Robocop
Robocop 2
Robocop 3
Scooby Doo - The WWE Mystery
Spy Kids 4
Fahrenheit 451
Rick and Morty Season 7
Wonder Woman
Justice League x RWBY part 1 - available in 1080p but not 4k?; Part 2 only available in 720p
X-Men Origin: Wolverine
Hollywood Homocide
Machete
Machete Kills
Once upon a time in China
Once upon a time in China II
Once upon a time in China III
Paul Blart Mall Cop
Paul Blart Mall Cop 2
Robocop (2014)
Robocop
Robocop 2
Robocop 3
Scooby Doo - The WWE Mystery
Spy Kids 4
Fahrenheit 451
Rick and Morty Season 7
Wonder Woman
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