is
If the entities should be shown/hidden asynchronously instead of scheduled to be shown/hidden on the main thread. By default, this is false and the entities will be shown/hidden on the main thread because they are real entities.
If the entries in culledEntityIds are fake/packet entities, and you have overridden isVisible, onVisible, and onCulled to handle showing/hiding them & it supports it, you can set this to true.