It's actually the way command consoles are coded in MegaMek. They are treated as a distinct cockpit type rather than a cockpit plus a console. So there is no way to combine it with, say, a small cockpit or torso-mounted (which would require a compact engine or gyro to make enough space). I hadn't considered it in a superheavy, and I'm pretty sure the rules forbid combine it with a tripod or industrial cockpit, but there are at least two or three combinations that should be allowed but aren't.
So yes, it's a bug. But I don't think it's going to be easy to fix.