i cannot drown, die in lava, burn, and cannot die from fall damage

So basically i got the new snapshot 19w39a and i fell off my monster spawner that is 74 blocks tall but i didnt die! so i tried to drown and when the bubbles gone, i got no effect i survived so I wnet to the nether then i fell in lava but i didnt burn and i tried setting my self on fire it didnt do damage the only way i could get damage is by hostile mobs so I was wondering if you could check it out and probally fix it and message after you solve the problem thank you if your reading this i love your game and i hope you fix this issue 

-Ravi