On realms pillagers from patrols (have not tested with nonpatrol pillagers) respawn upon unloading and reloading chunks even when name tagged and in a boat. Using a name tag seemed to prevent this for a short time but pillagers still despawned after enough unloading and reloading.
This has occurred 3 separate times on the same realm.
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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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Mobs face many dangers from the environment or other mobs that could explain why they are gone. Could your pillagers have been hit by an iron golem, or lightning, or stray arrows? Or could they have shot each other by mistake, or been killed by another player?
We will not be able to confirm a bug unless we can reproduce the issue, so we need you to give more details about the circumstances of their disappearance.