Well, both MS and Asobo, really. Somehow, the download from the marketplace is either different, or installed differently in the sim. Before the update implemented by Asobo, this difference did not matter, but after the update it does. It's not obvious where the coding fault lies, but it certainly was not picked up by Asobo in the pre-release testing they did. Or if it was picked up, it was ignored.
The beta testers are of course subject to an NDA, so cannot confirm whether or not they reported it.