Cannot find child in FilteringEnabled?

When I add a StringValue with a BoolValue inside in the Workspace, this function is supposed to run in a LocalScript inside the PlayerGui.

Workspace.ChildAdded:connect(function(child)
if child:IsA("StringValue") then
    print(child.Name)
    print(child:FindFirstChild("BoolValue").Value)  
end
end)

It doesn't seem to be working when I set the game to Workspace.FilteringEnabled, and only finds the child, and returns BoolValue as nil (It does work, however when it is not in FilteringEnabled).

UPDATE: I managed to come up with a alternative for now, not sure if there is a simpler one. I added an ObjectValue just to simply store the StringValues and BoolValues so DescendantAdded will only check the ObjectValue.

Workspace.ObjectValue.DescendantAdded:connect(function(child)
if child.Parent.Name == "StringValue" then
    print(child.Value) -- Prints the value of BoolValue
    print(child.Parent.Value) -- Prints the value of StringValue
end
end)

I'm not sure why this works in FilteringEnabled if you get the instance you want in the parent's instance.