After breeding several pairs of turtles, hearts appear above them, XP is given, but they just swim around in the water afterwards, rather than going onto sand and laying the eggs.
Breeding turtles process worked as intended on previous update (1.6.0.1)
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-35045 due to the more general or descriptive summary.
Your votes, additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
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