I think this is the designed behaviour as the idea is that all changes are accepted or rejected before generating. You should get a warning that the topics contain tracked changes when you generate. I agree it would be better if the preview allowed you to view the topic as if all changes had been accepted.
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I already thought that this was a normal behaviour. Well, it's not what I have hoped for. It seems that Adobe added the tracking feature but did not think enough about the useability and features.
I will enter a bug report and hope that other readers will do the same.
Just thinking: Adobe adds features which contains bugs, and to get the bug-free feature, customers have to pay an upgrade.
And so follows the software world </grin