I suppose I’m just unlucky enough then. The first time I had that issue moving from stable to dev directly using the installer without deleting the old version caused my MCDU to not properly load the flight plan coming from the world map, and my display screens just blanked out. I couldn’t turn it on using the brightness knob.
So I deleted the A32NX mod, then use the installer again to download a fresh copy of the same dev version. Then my MCDU loaded the flight plan correctly and my displays came to life.
This happened months ago using the very first version of the installer though before the more recent updates to the installer. And that’s probably only happened to me and not to everyone else. I’m just saying that to make sure the build is clean when installing. And it’s just an extra 2 seconds thing to do, not that big of a deal.