Week off, annotations and ad-hoc training plans

I’m using ad-how training plans (base 1, base 2). I have a couple of business trips coming up, will need to push off the training accordingly (yes, we’re back to “push week”). I tried the method indicated on the TR website - insert an annotation, select time off, select the dates, admire the magical results. Except the only result is an annotation in the middle of an unchanged plan. So -

This method only works if I use Plan Builder? Or I messed up somehow?

You haven’t messed up.

IME, when I’ve added time off annotations to my calendar (with a Plan Builder Plan added), it has simply deleted any workouts that were previously scheduled where the annotation now exists. I’ve not seen any instances where it would push forward any (now missing) workouts…