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Following:

We strongly recommend using the official Japanese website. Databases such as anidb, MyAnimeList and Anime News Network, or trustworthy sources such as Syoboi can help you make informed decision, but they should be used with caution. And please keep in mind that every database has their own, unique guidelines.

We can see: https://myanimelist.net/search/all?q=Bungou%20Stray%20Dogs&cat=all

https://anidb.net/anime/?adb.search=Bungou%20Stray%20Dogs&do.update=Search&noalias=1

In japan they air episodes in 3 season with years distance between each others

series with continuous episode numbers are added as a single season

One piece has continuous number, but it is split into 21 seasons... https://www.themoviedb.org/tv/37854

we can still keep continuous number, but split those in season for reference

@jljjch said:

One piece has continuous number, but it is split into 21 seasons... https://www.themoviedb.org/tv/37854

The merge of these seasons is planned and will occur at a later date.

we can still keep continuous number, but split those in season for reference

You can use episode groups to manage specific seasons split, for example this one.

we can still keep continuous number, but split those in season for reference

You can use episode groups to manage specific seasons split, for example this one.

This example looks fine, do you know how can see this on kodi or similar? Also the "season" have different posters, how can connect them to the cour?

@jljjch said:

This example looks fine, do you know how can see this on kodi or similar? Also the "season" have different posters, how can connect them to the cour?

You will have to ask the Kodi team for this.