Yes - I’ve seen the same issue re: terminal buildings ‘popping’ or ‘showing through’ fog. And overall performance re: FPS, stuttering etc. at LSZH is not great when compared to add-on airports of similar size / quality from other devs (e.g., Flytampa, Orbx etc.).
Overall - I really like most of Gaya’s airports for MSFS… but LSZH clearly needs some more attention… Hopefully an update soon