No idea, it's corrupt or something. You download it and tell me if you can open it on your end.
I may have been sharing it wrong - I just copied and pasted the files into Google Drive.
I found the issue however. It turned out to be an add child action that was causing the issue - I disabled everything and went through every line, disabling and testing and that seemed to be the one. Still strange that it only became an issue after updating though.
Thanks for looking into it anyway. I'll try to figure out how to properly share files.