I’ve been having the same problem recently, i think i’ve already concluded this happens to all my projects, even older ones i haven’t touched, but packaging worked fine. I think this is a glitch made by the developers themselves, so i’ve stopped working on fixing this for a bit, and i’m assuming it’ll get fixed by the next update. If you’re really desperate though, you could try installing an earlier version of unreal 5 and seeing it packaging goes well, to convince yourself it’s a problem with the program itself right now