Patrol Pillagers despawn even when name-tagged and in boat

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.