While in the speedrun I manually inserted the satelite in the correct slot in the silo, the silo had auto-launch ticked. It didn't launch.
Reproducable by: Setting a silo to auto-launch with satelite, take a satelite in hand, put it in the rocket inventory.
That could have been the case in the speedrun, but the picture I included is on a map where I haven't launched a rocket in ages and that rocket has been ready to go for forever. Ticked auto-launch, inserted satelite, nothing happened