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This behavior has been debated ever since action groups were introduced. Some people want the behavior you describe, thinking action groups are akin to actions. Others think they're more akin to projects, and that the fact that you have completed all the actions in them does not necessarily mean that you have completed them. You might have more planning to do on them.

Me? I wish that they behaved like parent actions in Life Balance, which appear on the task list only after all their children are done. Then you can decide whether to check them off or switch to the outline view and add more children.