I’m fairly sure this has been already mentioned way back. Actually I’m pretty sure I even participated in that thread. But the fact is that still after so many weeks we still get missions not refilling.
Curiously it seems to happen more often when you complete multiple missions in a row, and by that I mean, all missions during a 9h window or so. Almost seems like the game is telling me: slow down on the missions, you’ve earned enough credits already, have a break and come back later… Would suck if that’s the case, better to put missions with longer time intervals then…