Changing value not invoking metamethod __newindex but value is being changed

[astraIboy (The Batman)]

Hello, so I am creating a resource system where every resource will have its own seperate health n stuff like that but the problem is that, when I am trying to change the health after I created the object it isnt invoking the metamthod __newindex but weirdly enough it is actually changing the value though

local Resources = workspace.Resources
local ResourceManager = {}
ResourceManager.__newindex = function(self,index,value)
   if index == "Health" then
      print("Health value changed to "..value)
   end
   rawset(self,index,value)
end

function ResourceManager.new(Instance)
   local self = setmetatable({}, ResourceManager)
   self.Instance = Instance
   self.Health = 100
   return self
end

for _, model in ipairs(Resources:GetChildren()) do
   local newResource = ResourceManager.new(model)
   task.wait(1)
   newResource.Health = 0 -- This isnt invoking the metamethod
end

return ResourceManager

[astraIboy (The Batman)]

Alright so did a bit more debugging turns out that I have to actually put the __newindex inside of that actual self object then setmetable on it like so

Works as intended!