I was playing the beta version with a friend against the IA and I found two bugs, one is easily replicable, but the other I have no idea how or why it happened.
First one: whenever I'm fighting with my ACU, and I tell it to use overcharge on a unit, he would instead use it on the same unit he's already focusing fire on. Only when it's not attacking a particular unit (i.e. turning to attack a new target), is that it uses overcharge as it should. I think this is easily replicable since it happened almost everytime I wanted to use overcharge.
The second one I don't know how it happened, and I lost the screenshot but my acu was firing and building at the same time for some reason. Sorry, I can't say much more about that one, only that it was under fire.