Yes, I collided with that, too!
My chain of scripts driven by (and driving) some of my goals started to get out of whack:
what I have found is that by moving this one goal’s deadline, since I feed it by autodata, I need to move the feeder goal’s deadline, so that they’ve got the same sense of what day it is, which then puts them out of sync with tagtime, both of which feed into my clever spreadsheet that calculates my invoices, which … aaargh!
My current solution (and you may hate this!) is to keep a QS-and-calendar-friendly goal with a midnight deadline, and to mirror all/some of the datapoints to yet another goal that has a different deadline.
Would an export calendar-day-datapoints feature be of use?
Related post: One Real World Goal, Multiple Beeminder Goals