Problems playing series on TV

Hello, I have a problem with playing some TV series in Plex. I can save the TV series on my external hard drive of my PC and Plex can read the series in the library without problems.
My TV is from Thomson and when I open Plex, the series are displayed normally.
However, if I then want to start an episode of a series from the beginning, then the Plex logo comes and the playback is canceled.
However, if I play an episode briefly on the PC beforehand and then click on “Continue” on the TV, then it also plays the episode on the TV.
Strangely enough, I only have the playback problem with certain series and not with all episodes of a series.
Can someone explain to me what this could be and how to solve the problem easily?

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