Ok : sorry for my changes.

The problem was the value "yes", not clear because Antartica is also a desert (the biggest on Earth) and not at all the same kind of desert.

According to taginfo https://taginfo.openstreetmap.org/keys/desert#values, desert=yes is only one in osm database (it is why I removed this tag).

But I agree with you, to remove it was a bad idea. I should have improve it.

So I will now suggest to change the value into desert=erg. What do you think ?

note = on the english wikipedia page, they don't give examples of erg desert. But on the french page, https://fr.wikipedia.org/wiki/Erg_(d%C3%A9sert), they talk about the Taklamakan.

Best regards