I’ll sent in a support ticket too, but I think it might be worth mentioning that I’m seeing super old Netflix data still showing up as available to watch (I’m in The Netherlands), but it’s been removed for the longest time.
For example this show Crossing Lines isn’t on Netflix anymore, I think not in any Netflix country actually, since September 2020. But even today it still shows up. Sure, the last refresh was April 2021, but if Watch Data updates each night, that shouldn’t be an issue.
