Hello. Can anyone explain to me how projects can become broken without any change? Recently I've updated my Unity Editor to the 2020.3 version and converted a bunch of my old projects for this new version. After the conversion, everything seemed to work fine and I just closed everything. But later, when I've opened those projects (actually I only tried two of them so far but that's not the point) again, I had some error in the scripts out of nowhere. I suspect that this is some sort of bug but I don't understand how is that even possible. Does Unity change something with every launch?