Yap, there was a change in the NumberPicker that seemed to have caused it: https://github.com/android/platform_frameworks_base/commit/a...
Other 50% of comments: why is the patch taking so long!
As a former intern, usual Google practice is to rollback rather than attempt to fix with non-client apps, in order to take a more measured approach to the issue and not accidentally break something with a hasty fix. Android is in a different position as rollbacks aren't possible, but my guess is the release managers would take a similar view to not rushing.