After the latest updates to the weapons system in the Mirage, I am able to mix various different kinds of air-to-ground munitions with no issues. I was even able to effectively use every weapon in the following loadout: rockets on outer pylons, 4x Mk82 AIR on inner pylons, 4x Mk82 slick (ccrp) on wing root pylons, and GBU-24 (also worked with a Belouga) on center pylon.
The manual claims the following, "not possible either to mix different kinds of air-to-ground weapons. Doing so (for instance rockets and bombs, Mk-82s and Belougas etc.) may result in system not being able to handle the configuration and thus not work properly." This was definitely modelled before, i.e not being able to use rockets with bombs loaded and a few other things.
I am not sure if this is a bug or if this is a revision to the previous behavior to make it more in line with reality, so posting here instead of bug reports. Trying to use a Super 530 with A/G weapons does result in an error as it should.
(I'm hoping this is an update and not a bug, because it's awesome.)