Base Defense Glitch

I couldn’t f12 it, because I ended up loading and working around it, but I ran into I think a corner case bug. Aliens were going to be attacking my base where I had everyone. I was anticipating an attack at this location. With everyone present, the base defense counter would hit zero, I would click the “ready defense” button…but no mission would launch. I repeated this twice, then finally worked around it by sending off manticore 1 to defend a nearby attack. That left 26 folks in the base (counting the scarab), so I was originally trying to defend with 34 units. Which may have been an issue.