Got a canned response - case is still within normal processing time. The prevailing advice seems to be to keep sending them in until you get some action, but we didn’t send another one since we’re out of the country atm and don’t want to force the issue while we’re away.
Hoping that nothing will happen until we get back to the US. Even if we do get a notice while we’re away, it should be possible to call them and reschedule, though, with everything USCIS, that sometimes leads to its own set of problems.
As far as biometrics go, it seems that not only the left hand doesn’t know what the right hand is doing, but the left hand doesn’t even know what the left hand is doing. But what can you do? We just can’t put our entire life on hold for potentially 6 months because of this.