package your game in unreal engine is hell. every time I want to pack my game I get an error and it takes me days to solve it. if you don't know how to do it look it up on youtube
have a good day :)
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Yes, I have had this experience as well sometimes running into obscure engine bugs I have to work around. It does happen less in UE5 than UE4 from my experience but it can be difficult to track down if the logs don't have much info and a quick AI chat/search query cannot find. My best advice for that is to build early and often. I make sure to test a packaged build at the end of every major feature I add or at least once a week while working on my projects. At least then I have an idea of what I could have done that led to the packaged build error.