Hello - I have this item in one of my agenda files:
** TODO Pay estimated taxes SCHEDULED: <2018-03-31 Sat> DEADLINE: <2018-04-17 Tue -20d> and org-agenda-skip-deadline-prewarning-if-scheduled set to 'prescheduled. Since it is scheduled for a date later than today I would expect that it doesn't appear on my agenda today. However, it looks like the prewarning -20d is causing it to appear anyway. Am I misunderstanding something here or is this a bug? Thanks, Alex