Around 3 out of my last 50 games I experienced a bug where my pre-spawn build order was cancelled when using random, leaving my com idle at game start.
I think I have figured out how to repeat/what causes it:
1 - Load in to game, select Armada (or Cortex)
2 - Place down the buildings in your start queue
3 - Select Random
4 - If you random the same faction as the one you placed the buildings as, you keep the build order, otherwise it cancels them.
I have recorded it on youtube, first with the build order being preserved as I random Arm after placing Arm buildings, the second time I random Cortex and the build order gets removed.