The naming convension rules allow Plex to detect merged episodes but really doesn’t do anything with that
I would propose that in this usecase, both episode names be listed and selectable on the episode page. Whichever is selected has the respective episode information displayed. No control changes, merely text updates
There’s already an existing suggestion discussing an option to show multiple episodes grouped in a single file as a single item in your library / season. Although it’s primarily focusing on aggregating the available information, not to switch between them.
I suggest you comment/vote in that thread in order to help us avoid distracting or cannibalizing votes.
Plex no longer duplicates these episodes, merely pretends the 2nd part (or Nth part) does not exist. That thread is out of date to current behaviour.
Honestly, the comments confuse the ask to the point that it’s never going to go anywhere. I’m trying to be clear in the ask that only things like episode number, rating, description, cast, etc. can toggle back and forth between episodes while leaving all current functionality unchanged. Ie: a primarily cosmetic change based on data that’s already being sent but not handled
If it’s a bug then here’s some additional details:
I manually changed the episode number to the specified format S07E09-E10. Selected “Analyze”. This updated the episode and Plex set it to episode 10. As I wanted both episode details I tried setting it to S07E09-10, selected “Analyze” and it set it to episode 9.
I would still consider this a feature request to create a display toggle on the episode page & list a single episode on the episode list as “Episode 9 & 10”. This would improve the experience overall. As is, users maybe confused by the duplication and episode runtime will be incorrect (displaying file length on each rather than the episode length).