Oh, interesting. I didn’t realize that.
Is 25p a similar issue? I know almost all UK TV series (like Doctor Who) have to be 1080i50 on Blu because 25p isn’t doable. Which is why some of the sets (like the DW S1-4 upscales) are slowed down to 24p.
I believe 1080p25 is not in the Blu-ray spec, so that’s sort of the opposite problem.