The 2 episodes currently numbered on ZDF site as S05E21 "Das dritte Feuer (1)" and "Das dritte Feuer (2)" were originally broadcasted as a single double length episode on June 1st, 2009.

You will have to find an official proof on the way this double episode was numbered by ZDF at that time, before we do any changes.

@superboy97 said: The 2 episodes currently numbered on ZDF site as S05E21 "Das dritte Feuer (1)" and "Das dritte Feuer (2)" were originally broadcasted as a single double length episode on June 1st, 2009.

That's right. It was a Special back then. But not Part of Season 6. So it destroys the entire Season 6.

@BigGranu said:

@superboy97 said: The 2 episodes currently numbered on ZDF site as S05E21 "Das dritte Feuer (1)" and "Das dritte Feuer (2)" were originally broadcasted as a single double length episode on June 1st, 2009.

That's right. It was a Special back then. But not Part of Season 6. So it destroys the entire Season 6.

We need an official proof of the way it was listed at that time.

Here you can see. On Staffel 5 you can see.

https://www.zdf.de/serien/soko-wismar

It is both the 21 st Episode. Das dritte Feuer 1 and 2

Season 6 starts with Episode 1 "Omas Engel"

@Darklord2003 said:

Here you can see. On Staffel 5 you can see.

https://www.zdf.de/serien/soko-wismar

It is both the 21 st Episode. Das dritte Feuer 1 and 2

Season 6 starts with Episode 1 "Omas Engel"

This is how they are listed NOW.

What we need is how they were listed at the time of their original broadcast.

So, the original broadcast, is the 1st of June 2009. Between the 6th (ends 22. March 2009) and 7th Season (starts 21. Oct. 2009). You can see on german wikipedia. https://de.wikipedia.org/wiki/SOKO_Wismar/Episodenliste#Staffel_6 May it's better to locate it to the Specials.

As indicated, we need an official proof.