Totem of the undying usage

I just went on the latest snapshot to check if there was any new stuff. I saw the totem of the undying and went googling what it did. Then when i knew what it did i took a few of them and put them in my inventory. I went in to gamemode s and went for some zombies. multiple can be used if you have low health.

What I expected to happen was...:What i expected to happen was that when one triggers the others wont be able to trigger before the effects have worn off.

*What actually happened was...: What actually happened was that when i was low on health and one totem used if the zombie/player get's another swing at you more of the totems is beeing used but the effect's dont stack so you basiclly waste more totems for the same effect as one. *
Describe what happened here

Steps to Reproduce:
1. 'Get a couple of totems like 4 in your hotbar.
2. Spawn a couple of zombies and type /gamemode s.
3. Let the zombies punch you and you ill probably notice it.