All I could find is the episodes were released on C More first, but the release is not archived.

I came across the same issue as OP, and since this ticket is still open I thought I should continue from it, even though it's two years old.

@banana_girl:

Here are old TV guide entries for this season, for the original airdate and original TV channel (C More First):

(Scroll to 21:00 for each day to find the entries.)

Episode 1: https://tv24.se/kanal/c-more-first/2018-04-12

Episode 2: https://tv24.se/kanal/c-more-first/2018-04-19

Episode 3: https://tv24.se/kanal/c-more-first/2018-04-26

Episode 4: https://tv24.se/kanal/c-more-first/2018-05-03

As you can see, all of them show single entries of a single airing of each episode, not split into two-part episodes.

Also, the current (official) streaming page agrees that it should be four episodes, not split into two-part episodes. https://www.cmore.se/series/s-fb7d20c8bd267183badc/season-6

They started splitting them into two-part episodes from season 7 and forward, which is supported on both old TV guide pages as well as on the current streaming platform. (As well as on Wikipedia, even if that isn't used as an official source.)

I propose that episodes 1+2, 3+4, 5+6, and 7+8 are joined together to form four total episodes for season 6.