How are the snow textures rendered on airport ground textures

Hi, my question actually consists of two similar parts,

1 • I wonder how the add on airports ground textures ( both grass and tarmac/apron ) can get clad in snow ? Do the designers add them or is it something MSFS2020 takes care of ? The same question actually may apply to the default airports as well.

2 • In accordance with the answer to the former part of my question, once the seasons will be made available in the sim, will the airport designers have to add seasonal textures to their already released airports as an update ? Or MSFS2020 will take care of it ?

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