It’s not just the meter btw, your hotbar won’t update the moment you join unless you either die or rearrange them.
You might have noticed it too but if you drink your bottle or eat from the hotbar, it won’t change the amount unless you do what is said above this sentence. Though of course it’s just a visual bug so it’s not like you have inf amount.
Doubt it, it’s probably just an issue with the script not working unless something overwrites it. Another example would be your animation not loading ( The stiff standing pose ) when you just joined unless you start moving.