Merms' ShouldSleep() function always returns false

In prefabs\merms.lua:432-436, 

local function ShouldSleep(inst)
    return NocturnalSleepTest(inst)
        and ((inst.components.follower == nil or inst.components.follower.leader) == nil and
        not TheWorld.components.mermkingmanager and TheWorld.components.mermkingmanager:IsCandidate(inst))
end

Due to the wrong position of parentheses, 

not TheWorld.components.mermkingmanager

is always false, which results in the returning value always false. Therefore, merms do not go sleep naturally at any time.