I have no idea, but it is.
For starters, Finance screen is completely borked, when you open it, all the numbers there are like $8,935,262,103 and -$923,436,244, and when you exit the screen, your balance is reset to the amount as at the start of the game.
A more serious bug is that all dropped loot disappears if you save in the middle of the combat, and then reload.
On the other hand, items that are not dropped from the enemies (i.e. found in buildings) respawn if you reload.
Sometimes, the screen will lock up with a "timer" icon during enemy turn and you have to restart the game.
Your settings in Options are reset if the game is restarted.
These are what I've got so far.