Hello HaPe-CZ,

the problem that you raise is related to a renderer. Instead of resolving this problem by changing the renderer you use for your purpose, you are skewing the data by removing a part of the train platform where the transport shelter is (the shelter in this case is still onto the platform). This results among other things to new visibility problems on other renderers. Take the change you made in Saint-André-les-Alpes with the official transport layer of OpenStreetMap https://www.openstreetmap.org/changeset/152330529#map=19/43.96985/6.50669&layers=T. Now it seems there are 2 platforms and a building in the middle. What should your general user think in this case?
What I also do not understand, shelters on platforms are displayed with the most standard layer Mapnik with a POI.

Best regards,

Patchi