I can't drown - I take no damage and the bubbles simply disappear after running out - and I can't fall to my death either - large jumps give me no damage.
Linked issues
duplicates 1
Comments 2
Thank you for your report!
We're actually already tracking this issue in MC-160464, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. Depending on the resolution, that can mean that it either will be fixed in the next version, or that it is not considered a bug and won't be fixed.
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you are playing an old world in the new snapshot which sets the newly introduced gamerules about damage types to false
just set the gamerules regarding damage to true und you should be fine (see MC-160464)