All units seems to be random whether or not it works. I’ve tested it and tried different cases but I can’t find any consistency. Sometimes it will select all units and half the time it will just select a couple of units. For instance at the start of the match I have three grunt squads. I’ll send them different ways to collect resources and then want to call them all back. Sometimes it’ll only select one, sometimes it’ll select two, but more often than not it doesn’t actually select all three.
Control groups are also broken. If I build a fourth grunt squad I can add him to the control group. But any selected unit that is already in the group gets removed. This makes no sense since the command is to add units, but it is also the same command to remove units. This means if I have all four grunts selected and try to add them to the control group, the first three will be removed and only the fourth will be in the group. This makes thing difficult when I have an entire group selected, and I’m holding shift to pan the camera quickly, if I accidentally press the control group it will all be deleted.