When typing in
/attribute @s minecraft:generic.max_health base set 1
so that your max health to 1, and eat a golden apple to get the absorption hearts, taking 1 damage(From fire, cactus etc) will make your red heart disappear instead of the golden absorption ones. Taking multiple damage does not cause this, (Ex.falling from 4+ blocks or getting damage by cactus 2 times. This causes the red heart to disappear and reappear)
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This issue can no longer be reproduced in 1.18 Pre-release 1. This was most likely fixed at some point.
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I tested this, and also noticed that when I removed the effect with milk, I got a whole (red) heart back even though I was on .5 Absorption heart and had presumably lost the red heart