So, here are a few pictures:
In the plan, you can see that the staircase is supposed to be flush with the wall and there should be a rough construction measurement of 1.05 cm between the stair step and the wall.
In this picture, you can see that the metal construction is already protruding beyond the wall. The finished stair step will protrude about 4 cm further.
Here is the staircase in section:
Here is the staircase viewed from the upper floor, where you can see that the last step (which is at the same level as the finished floor on the upper floor) does not have the full "depth" (step width):
Here the staircase rests on the ground floor:
The stair opening would basically have to be reduced by 10 cm to allow space for the shortened metal construction.
View from above:
View from below (before screed):
If more plans/pictures are needed, please let me know.