I have a disc with 2 menu A and B. A has the chapters of timeline 1 and B has chapters of timeline 2. A and B are linked by buttons.

In DVD, the menu button bring me back to the menu A. Title button bring me back to the last menu, either A or B depending where it starts (timeline 1 or 2 is playing).

However, the same project burned to Blu-ray does not follow the same. I noticed that there is title button, only menu, and it always bring me back to menu A.

Is this by design?

Thanks!