For some reason i don't take fall damage or drowning damage. I did had fall and drowning damage in the past, but for some weeks now i don't take damage anymore (the bubbles decrease, but afterwards there is no damage). I can still die from mobs and lava. I play on survival and with the latest snapshot 19w41a. Since this snapshot my birchtrees don't grow anymore. Other trees still do, but birch don't. Even after bonemealing stacks on it, it won't grow. I grow them the same way as before (lots of space, and i also try it on different spaces now).
edit: my zombies also have a black block head and now that i think about it.. after lots of nights not sleeping (more then 3 or more then 5), i don't get phantoms either..