I am unable to re-watch episodes of Discovery on my Roku Ultra as I would like. When I select an episode I have watched, the next episode I haven't watched is auto-selected & starts playing. Not sure if this is a Roku or Paramount+ issue or designed "feature"?
The way channels/apps function is mostly up to the developer/provider and is out of Roku's hands. That sounds like a "feature" Paramount has added and quite frankly sounds like a bug. See if there's any option under its settings to enable/disable "autoplay" or whatever they may call it.