Haha, thank you for trying @chrudimer !
As you can see, it’s difficult to find a “rule”. I have tried literally everything. In fact there is a workaround for this specific issue, but only for this error. Other errors will still happen: Shipping build crashes with DX12 and Raytracing enabled - #31 by Miguel1900
Anyway, you probably tested packaging without Project Launcher, right? It gives even more direct/evident errors.