if you find a difference in the manifest, then as it seems to be, the build process somehow removes a relevant part and this should then be fixed by the MIT App Inventor team. You then could send me your project as personal message and I will forward it to the MIT App Inventor team so they can find out, what exactly needs to be fixed.
I agree... this is only a workaround...
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by
Taifun.