Chapters from MKV File not having correct times

[OttoKerner]

@MetalDave239

Would ‘Personal Media’ be an equal Agent option to ‘Plex Movie’ and ‘The Movie Database’ from this perspective?

If you can live with typing/pasting in all meta data manually, sure.

@MetalDave239

As a further measure, I’m renaming the Title in the Plex Web Interface. I’m hoping this will further differentiate the 3D from the 2D title. Can you confirm if this works or not from the perspective of the respective versions keeping their own cached chapter thumbnails, etc. rather than sharing because of a common title?

No, Plex will use the guid="xxxxxxx" identifier to distinguish items. You can see it by looking at the Plex XML info of your library items.

@MetalDave239

However, it appears the titles in that scenario seem to share the same chapter thumbnails. That leads me to think the thumbnails are attached to the filename rather than the title. Am I right?

They should not, unless they are matched to the Personal Media agent.

Have you tried to remove all versions of this movie during a Plex Dance (no matter whether they reside in different libraries or not.)
Afterwards, add temporarily only one of the versions back and see if the chapter markers are correct.

Have you played the file in e.g. VLC, to see whether the embedded chapter markers are correct at all?

Have you checked the MKV files with MKVtoolnixGUI to see whether they may contain several different versions of chapter markers?