You have made 7 otherwise it would have worked, I always make it so on the xbox one

No, I only did 6 during the story. I know how many I did. I did the Deacon Blackfire one after completing the main story, just like I have in the route. You can watch the recording of the stream if you don't believe me. And, as it shows in the screenshot, it wants me to do 10 now.

If it works for you on the Xbox version, then it's possible that it's just completely broken on PC.

Here, this is what it looked like right after I beat the main story:

On which platform do you play?

Did you use a glitch?

I have it already several times made on the xbox one (German version)

I have almost always made mat-bat

Played on PC, and I didn't intentionally trigger any glitches.

I have 2 possible solution to your problem

1. Try to complete only 5 mission before the end of the story

2. Make a last mission with several parts like man-bat

If/when I do another run, what I think I'll do is just not complete any side missions until after the game is completed (but still do the other objectives on the same route), since as far as I know that's the only way I can guarantee that I'll only need to do 7 missions, and I don't feel like wasting another 5 hours to find out that doing it a different way doesn't work.

So yeah the way the game seems to handle it is that it wants you to do half of the remaining side missions after defeating Scarecrow. There are 14 side missions in total. If you do none of them and finish the game, it will tell you to do 7 of them (half of 14). If you finish 6, it'll tell you to do 4 more (half of 8).

Okay, that's still kind of annoying but at least we can work with it. I've modified the route so that you only complete side missions after the end of the story.

Though, I'm curious, if there's an odd number of side missions, like if you complete one and there's 13 left, I wonder if it'll want you to do 7 or 8.

Edit: Nevermind, looked at your stream and saw that you tried that.