I had 2 named sea turtles in an enclosure on a beach and they disappeared. They have been interacted with, fed seagrass, breed, and even were born in the enclosure. Named mobs shouldn't despawn.
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GoldenHelmet
kiizde
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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In order to confirm a bug we need to determine steps to reproduce the issue. Please update the report with more detail that could help us to recreate it.
Note that mobs out in the open face many kinds of dangers, and in some case mobs that we think we have trapped are able to navigate out of enclosures. If either of these explains your experience, it would most likely not be due to a bug.