Baby turtles swimming in coral reef will often swim under an overhanging coral block and when that happens they take (or appear to take) suffocation damage for few seconds before swimming away. In an dense coral reel, it's practically impossible for a baby turtle to survive to maturity.
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violine1101
Thank you for your report!
We're tracking this issue in MC-142711, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Duplicate of [MC-142711], which is fixed in 1.17