not_found episode list can contain either episode or series/season/episode response.

[SenorSmartyPants]

The NotFoundObjects Episodes list can contain a mix of TraktEpisodes and TraktShows/TraktSeason/TraktEpisode structure. It will contain TraktShows.. if the episodes are passed in without provider ids.

Currently, the show ids and used to set the episode ids in the response when no episode ids are passed in. The JSON should be parsed so it returns all the data provided.

jellyfin-plugin-trakt/Trakt/Api/DataContracts/Sync/NotFoundObjects.cs

Lines 26 to 30 in b3650c7

	/// <summary>
	/// Gets or sets the episodes.
	/// </summary>
	[JsonPropertyName("episodes")]
	public IReadOnlyList<TraktEpisode> Episodes { get; set; }

Check out this Trakt API issue I created for examples of the return data.

trakt/api-help#357

I uncovered this issue when working on #156