Yes yes.. that was not quite correct with the styrodur inside... I believe it's fermacell or fire-resistant drywall from the inside in the thickness so that we reach the edge of the ring beam.
Looks pretty nice, but we hadn't thought about that at all. How is it with you? Do you also have problems with a thermal bridge, or how is it solved at your place? What actually happens if such a steel support rusts? I don't think they are galvanized.
It is definitely colder in this area, but I would not necessarily call it a thermal bridge. The beam was painted beforehand, which also prevents corrosion. If no moisture forms there, nothing can rust. Of course, it is difficult to check this afterwards ;)