Steps to Reproduce
You are using the command / effect Instant_Health 100000 lv 30 to 255 when it receives the effect for the player and it receives damage, life does not regenerate automatically
Comments 2
Thank you for your report!
However, this issue has been closed as Cannot Reproduce.
We were unable to reproduce the problem you are describing in the latest version.
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Oh. That's called integer overflow. The character restores so much health it wraps around into the negatives.