Anders,
I feel your pain. I had that exact same problem with my 935 getting caught on its cycle in the same position as your bolt is from your pictures.
What's happening is that when the shell lifter moves up to push the new shell into the path of the bolt, the part of the shell stop assembly is spring loaded moves underneath the shell stop which then doesn't allow it to return back down; therefore, creating a locking bar effect on the system.
I fixed the problem by taking the gun apart and sanding and polishing the shell stop assembly body using (100,200,500,1000 grits and then using Flitz polishing compound).
If you remove the shell stop, which you can look up how to do on YouTube, you should be able to see where the shell lifter (the part of the shell stop has the spring behind it) is actually rubbing against the shell stop. I basically took the top corner of the shell stop off with a standard file and got it nice and polished. Clean everything off and re assemble and you shouldn't have the problem with the bolt getting caught up midway through its cycle path.
Hope that helps and if you need a better explanation, just ask.
Joe