Does DH "make up" chunks with Distant Generation?

I'm trying to create the LODs of a large map i downloaded, the map is already generated, i only need to create the "cache" let's say, i tried using distant generation but it seems like, it makes up things?, like it adds snow or trees where there aren't, i don't report this as a bug since i guess it's how the generator is meant to work, but i do wonder how does it work anyways?, does it takes the seed and makes a kind of approximation?
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