ACS 5-year tables for 2010 to 2012 block group level no longer available for download in data.census.gov

I noticed today that block group level data for the 2010, 2011, and 2012 ACS 5-year estimates are no longer available for download in data.census.gov, but tract level data for those years are still available there. Does anyone have any insight on why block group level data for those years are no longer available through this portal?