Huh, I find it kind of minor.  I knew something wonky was going on, but it never seemed "gamebreaking" to me.  It's one of those things that I barely noticed in game, but now that it's been pointed out, seems much worse.  

I completely agree with the OP.  One of the joys of a turn-based game is that you can walk away from it at any given time to go to other things.  For a busy person like me the save game bug makes FE unplayable.

I remember this exact same bug in galciv!

The FE game you reload is never capable of being the same FE game that you originally saved and it is a big sh-- because you end up leaving your computer on all night in desperation if your at a crucial part of the game but in the end it crashes because the game needs restarting every so often to run properly!

i've not played the new patch. i was going to, but reading about this bug killed that desire. i would agree that gamebreaking is a good term for it. 

with the way i play, i'd definitely find myself being overrun by a million AI soldiers even on beginner difficulty