In some Situation this Keybind does not work.
From antoher Thread:
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I believe it happens when I order a group of villagers to build farms. If there are more villagers than farms to be build, the villagers which finished building farms and become idle are not selectable with the radius idle villager select hotkey.
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It also happens, when new Villager are build and arent rallied to a Recource.
Another indication of this Bug is the absence of the “zZZ” Signs over the Heads of these Vills.