Sure as hell did. I can't believe Nutari was questioning this after all the threads with pix on Mazda 3 Forums. This has happened to at least 4-5 MS3's so far with another 1-2 catching the loose tranny bolt b/f it fell out and tightening it up. The later production models appear to have been loctited before delivery, either at the factory or later.
There are some threads on street unit where a dealer tech says they've seen this and it's all due to abuse. From your posts (and most of the others elsewhere), I say that is bigtime BS. Of course Mazda's even paying for the one case of very clear abuse (alleged redline clutch drop), so they at least know it's not just abuse. So far the repairs have been effective without further issues, but check the threads out for yourself so you know what your in for.
Good Luck!