I use Infuse 5.8 on two Apple TV and on my iPad.
The Up Next List is configured on all devices to show only movies or tv shows which are “in-progress”.
But very often, movies appear in the up next list, that are already watched.
to make them disapear, I have to mark them as unwatched and than as watched again.
But if I now start Infuse on an other device, where the same movie may be also in the up next list, this device will sync its up next list to all other devices. So in the end I will have already watched movies again in the up next section.
I think there is a general bug in the up next logic, that will show movies, which are marked as watched, in the “in-progress” section.
And if you use iOS and tvOS devices, this will make a complete mess.