My friends and I are playing on a server via Aternos in version 1.21.7. We brought the happy ghasts from the Nether and put them in the water. We waited for them to grow, and once they reached their full size, we could fly with them. However, for no apparent reason, three of our ghasts were suddenly deleted. The ghasts were tethered, so they couldn't have escaped. One of them had a name tag. And I can also mention that the ghasts were right next to where we lived.
Please help—why might our ghasts have been deleted?
Please check if you can reliably reproduce this issue in the latest snapshot (getting the happy ghasts to despawn on worlds other than the one where you originally experienced the issue).
If you can reproduce the issue still, attach a copy of the world to the report.
(Note: The original happy ghasts noted in your issue still being gone from your world does not count as still experiencing the issue)