There are some important rules you should pay attention to.

  1. These items that are part of a scheduled piece of work will be created two weeks before the work’s planned start date (unless customized - see further reading items below), and will be copied directly from the piece of work scheduled to start immediately before it.

  2. Once this happens the new Tasks will be ‘divorced’ from the Task list it was copied from. This means it won’t be updated if any changes are made to the Tasks in pieces of work that are scheduled earlier.

  3. The ‘divorce’ of the Task list will happen sooner than two weeks before the piece of work’s planned start date if you manually change the work’s status to ‘In progress’, or if you click on the Task tab. If you do either of these actions, the piece of work’s Tasks and to-do items will be created.

Further reading:
How far out do tasks get created?
How far out does work get created?

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