Re: Is it a bug?
If it was a tiny bug it could be fixed.
What makes you so sure it can't be fixed? FWIW, I suspect it is probably not a "tiny" bug, but may not actually be that hard to fix (off the top of my head I can imagine, for example, a training regime which omits random frames, or perhaps a sub-system which recognises highly uncharacteristic frames, which might mitigate the problem).
This research may well turn out to be rather useful to Google (although I'd also be slightly surprised if they weren't aware of something similar already).