I observe that playback progress on titles I am playing in Infuse 6.x does not match progress on same movie I've been watching on another Plex client. E.g., on my Roku, I'm an hour into a movie. If I look at same through Infuse, it shows me only 30-ish minutes in (I think, where I left off playing on Infuse). I also noticed that if I start playback on Infuse, I regress to Infuse's idea where I'm at - and it screws up my real progress, as seen by the Roku.
Doesn't Infuse try to "play nice" with PMS so clients all have an idea where playback paused? Also, checking the PMS Web UI, it corroborates the Roku view, that I'm an hour in. So Infuse has a different metric, its own, apparently...
EDIT: Additional data point, the official Plex client on the ATV4k shows the correct progress (same as Web UI and Roku).