Undergames Question

Hi, after completing both campaigns i started the Undergames with Volta on master. The first map on master difficulty was drawn out, lasted really long and got annoying a little bit with all the enemy worker/creature spam everywhere but i managed to destroy the rival core shards. Now i don't know if this is intended or a bug, but during the game i lost one of my core shards and when i destroyed the final remaining enemy shard the game just continued on. No win or failure message.

Do i need to have both shards to win? That would suck if so, since it was a bloodbath on master and it's only the first mission in the Undergames. (shudders) 

Also loading both an autosave or a normal save sometimes no ui appears and the game needs to be exited. This is in campaign saves.

Another thing I've observed is that the game writes a lot of data on a SSD. After a few new games or loading saves, I've had up to 14gb of data written. No big deal since new SSD's can handle this but it strikes me as interesting. It probably is a Unity thing since I've seen this in other games with this engine.

P.S

Do you want me to provide you with saves or log about the Undergames map?