Minecraft 1.18.2
Roots 1.1.23
Single Player

Healing poultice seems to have no effect after eating.

Healing Poultice heals 2,5 hearts upon being eaten

I'm a github noob so I don't know how but I'd like to reopen this as it's not resolved yet. I think I might know why you believe it is.

After some further experimentation I've discovered that the healing poultice works fine so long as you eat it when it's stack is higher than 1. If it's the last poultice you have then you eat it without any healing effect.