1. dip yourself in molten lead
2. observe that the tick for damaging is like set to 1 or something
   newest version btw

I mean, you can't place it in a block a mob is standing on

https://www.youtube.com/watch?v=1vHo3-_1DGg&ab_channel=DoltHHaven this is what i meant

This, will be fixed in the next release, damage should behave more like lava