Player with incorrect UUID and nickname

https://api.mojang.com/users/profiles/minecraft/_

Returns player that shouldn't exist based on rules

This player also have incorrect UUID (`u` digit in base-16? 3126ba4c6*uu*d424c877d1347fa974d23)

{
  "id": "3126ba4c6uud424c877d1347fa974d23",
  "name": "_"
}