I can confirm that camera, bluetooth and side stage are all broken using UT on Nexus 7 LTE 2013 (deb). Frankly, based on the device's age, I don't think fixes are going to get made any time soon, or should be made a priority. It would be really nice if more up to date 7 or 8 inch tablets were ported to UT though.
Best regards,
Steve Berson