I wonder if surface=stone:plates is the right choice here. In Switzerland, this value has been used only 21 times, mostly by you, and is not documented in the wiki [1]. Looking at other steps and the wiki, I think surface=paving_stones [2] would be more appropriate. paving_stones value is used ~2,500 times in Switzerland. Also, I believe Osmose would be happier with the new value [3].

Would you be offended if I changed the surface to paving_stones?

[1]: https://wiki.openstreetmap.org/wiki/Key:surface#Values
[2]: https://wiki.openstreetmap.org/wiki/Tag:surface%3Dpaving_stones
[3]: https://osmose.openstreetmap.fr/en/map/#zoom=18&lat=47.468095&lon=8.330109&item=xxxx&level=1%2C2%2C3