Random map pick - How does it work

A question for devs/mods or someone who knows it 100%

I would love to understand how the map pick truly works!

There are 15 realms and 35 maps, if the game picks a random map does it pick first 1 realm out of 15 and then a random a map out of this realm. Or does it realy pick a random map 1 out of 35?

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