I'm not sure whether this issue I have is save-dependent but I'm giving up on the save I attached in the previous message. I'm not sure whether this issue may reappear in my new save, however, I'm giving up this current imperial guard run and starting a new one. It's not due to how I'm now going up against terminators while my swarm of imperial guards only have lascarbines and a few bolters, but the fact that I discovered another base other than the bugged base indicating that there are 5 other enemy bases, one of which is filled with terminators, excluding the traitor guard one.