If you manipulate the player size with add-ons, the player will show drowning bubbles as if the player is in water. The only way to survive is to drink a potion of water breathing. Other mobs are unaffected whem you change their size.
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Cleaning up old tickets: This ticket has not been updated recently (1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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I can confirm that bubbles appear as if underwater (1.0.4 on Win 10, and 1.0.5 beta on Android)
Test world and screenshot attached.
If you are able to upload a copy of the world + behaviour pack where you receive drowning damage that would be useful.