Latest updates busted magnetic cover wakeup?

I've been getting a lot of android 5 updates recently, and on both my 2013 and original Nexus 7, the magnetic covers no longer seem to wake the tablets. I wouldn't think the sensors in both of them would break at the same time :). I remember the tablet had this problem when it was first released, then updates fixed it. Have they gone back to the original code again to preserve battery time or something? Has anyone else seen this?