Hello HaPe-CZ,

I don't quite understand why you change the platform ways from the train stations Saint-André-les-Alpes (https://osm.org/way/395252564) and Entrevaux (https://osm.org/way/396734929) into a multipolygon.
First of all the platform areas are used into the train relation and therefore wo do have now some inconsistencies. The former platform areas with the role platform are no platforms anymore (just a outer way from a multipolygon).
And secondly I doubt, that the shelters which are used as inner ways for the new created multipolygons are not onto the platform. What is the problem to have a shelter onto a train platform area? In my humble opinion it is not necessary to create a multipolygon, there a several objects onto train platforms and a shelter is one possibility. In this case the shelter is still a part of the platform. With your change to multipolygons it suggests that these shelters are not a part of the platforms.

Best regards,

Patchi.