Shovels Don't Have Safeties
You can no longer build in invasion mode before the setup timer ends. Why? Because of the newest mega mind feature added in v2.0: Guns on safety in main. Gone are the days where you could shoot people in the main base without hurting them, woe be unto the meme lords. More importantly, gone are the days you can actually dig fortifications in on invasion defense because apparently, shovels have safeties that must be kept on until the enemy is rushing at you with vehicles.
If this change to invasion is intentional, it flies in the face of the setup timer itself. Why add extra time for defenders on invasion in the same update that prevents them from digging anything in until the match has already begun?