Once again, sorry for the late update. Upon further tests, it looks like the issue was a slightly broken transition from 4.6 to 4.8. While I don’t explicitly know what was wrong, creating new demo projects and packaging them for shipping worked fine, and at the current stage of moving content to the new project, everything seems fine. If something does flag up as we convert, I’ll immediately bring this to your attention, otherwise this problem is solved.
Thank you for your time,