Playing genesis missions.
Last two missions, you can get the substrate lvl 4 whatever its called drone swarm thing.
You can not single click. or Double click it - in anyway (trying to select it.)
You can only drag select over it.
Any clicks just go straight through it to the things underneath. (hmmm... i wonder if it was only a bug when its over the top of buildings.).
Either way. it happened multiple times.
I presume it does the same in skirmish /multiplayer as well. Never tested.
Edit: Okay, i replayed the last mission. Whenever your 'nest of the queen' is over the top of any sort of building. You can not click on it. The clicks just go straight through and select whats underneath.