iTunes Match still downloading on 3G even if told not to
The past few months I've gotten warnings from AT&T that I was near or exceeding my data plan limits when I never did before. After a lot of testing it seems that on my iPhone, iTunes Match still downloads data—megabytes worth—even if I have the "download over 3g" setting turned off. I've had to turn off iTunes Match on my iPhone totally and rely on "old-fashioned" syncing unless I want to upgrade to the bigger data plans, which I'm not going to do. Sigh! Anyone else notice this? The behavior persists over several erase-and-restores of the phone.
iPhone 4, iOS 5.1.1