The hand in the jar isnt working, after you reach 100 regeneration energy it doesn't let you use it.
Next: Whenever you use the sword to take off a hand it doesn't have your name. You also never grow it back, even when you finish the regeneration cycle or regenerate again.

It's currently nearing the end of ny day, tomorrow I will investigate this issue and give you an update

The hand thing is just client side, it needs a internet connection to look up the name haha

Thank you

Hi, I'm pressing my force regen bind while the container is at 100 energy as Im regenerating nothing happens when I press my force regen bind. Also, Im using paid minecraft. My arm grew back after I went offline for an irl day so its likely client side.
I havent tried this today so let me check if it works yet.
Edit: Still doesnt work for me.

Hi,
When trying to use the BioContainer, what approach are you taking? As it's been changed a few times

As for the hand, it saying null is ignorable, as it's just w cosmetic name, but this can happen if you're on a fake Minecraft account or if data us just slow at processing

It turns out I removed the feature of stopping a Regeneration with that

Instead now, when the jar is at 100 capacity and has a hand, you can right-click it to gain a Regeneration
It seems I have some documentation to update