In Survival Do falldamage, doinsomnia, dofiredamage, and dodrowning are all set to false. And if you have cheats off, you can't change these. Please turn off these as the default. It removes a good chunk of challenge from the game.
MC-162315
In Survival Do falldamage, doinsomnia, dofiredamage, and dodrowning are all set false.
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You have opened the world in 19w36a, which caused this issue to happen. Set the rules to true manually. This is just a thing that sometimes happens during snapshots.