your description makes sense to me. You should be careful when invoking code to close the browser. My advise is to refrain from doing it without a good reason. This is especially true when using the RecycleBrowser feature which will attempt to use a single browser for all your tests (thus saving time) - see attached screenshot.
Some steps will close the browser with an action. For instance popups are treat by Test Studio as another browser and can be close by a per-recorder action.
Also don't use:
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