Describe the feature you'd like to see implemented:
Regenerations in hardcore mode.
To put it simply you cannot regenerate in hardcore mode and I think it would be an improvement if you could use regeneration's as a means of bypassing death in hardcore survival worlds.

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That is really odd, do you happen to have any other mods installed?

I had a few other mods installed, yeah, I'm not certain what was installed though, I'll have to test it again later on.

Hey! I did a test with this, you should watch the below video

https://streamable.com/175ko

I could be mistaken, but from my own testing, in Hardcore mode the player just dies, even with regenerations available. I noticed this using /kill, odd thing is /kill will activate a regeneration perfectly fine in Creative...

I will look into this more, but for now, I'm going to label it as more info needed until you can provide more :)