ScalingHealth-1.15.2-3.0.5+52
SilentLib-1.15.2-4.6.1+49
forge-1.15.2-31.1.77

Optifine + Optiforge
OptiFine_1.15.2_HD_U_G1_pre15_MOD
OptiForge-MC1.15.2-0.1.17

Another mod

Cyclic-1.15.2-0.4.1

• cyclic heart item was disabled in config

Expected Behavior

after use Heart Crystal get 1 heart
and when player die player heart shouldn't increase

Actual Behavior

after use Heart Crystal get 1 heart
and when player die player heart will increased

Steps to Reproduce the Problem

1.new world (10 heart)
2.use 1 Heart Crystal to get 1 heart (11 heart)
3.die
4.observe health have increased by 1 heart (12 heart)

could you try without optifine/optiforge please? also use a paste site to give me the latest.log in your logs folder once you do that.

https://pastebin.com/HHwvkMzP
I remove optifine optiforge
but issue still exist

I downgrade version of cyclic mod to version
Cyclic-1.15.2-0.3.4
the issue don't seem to happen anymore

Okay super, could you then report the bug on cyclic's page as well and reference this issue? To see if they have an idea what could be causing this.

Hey, @Cyborgmas. I'm the developer of a mod called LevelHearts, and I have an issue with a very similar report to this. I was poking through their code noticing they use a very non-standard way of modifying the player's health. In fact, I just noticed that they modify the BASE VALUE of the health modifier, instead of using their own modifier. This is an issue on Cylic's end.

Thanks for letting me know and the in depth reporting!