T-Mobile US are pioneers of ipv6-only with android devices using 464xlat and have been for 3 years now. By trying other device types they are again pushing the agenda for all operators strapped for IP. I am sure they will receive a little flak for this bug.
But take your eyes off the operator for a moment and forgive me for asking this: we have a massive organisation with a market leading set of smart devices, so why in 2016 is a full ipv6 build still a beta? (i.e. can you guys test it for us); and the various regional address authorities practically ran out of v4 addressing a year ago?