Sensors activate while loading grid in gravity well

So I made a bomber of sorts using rotors to attach bombs to a bomber. Since I have no experience with programmable blocks in space engineers, if I want programs to activate in the bombs without manually going into the ship's config and rebinding all the activation groups to the bomber's hotbar/timers, I have to use sensors on the bombs to trigger them once the bombs detect that there's no more subgrids.

This works perfectly fine... until I reload the world. For whatever reason, upon loading the world, the sensors briefly cease to detect a subgrid is attached, and then all of the bombs simultaneously activate their thrusters and gyros. Which is annoying.

After a bit of testing, I've concluded that this bug only happens in a gravity well. In space it is fine, but once on the planet surface, loading in the tech causes the sensors to trip and the bombs to activate their thrusters.

I've attached a zipped file of the troubled bomber (with it's loading trolley and bombs pre-attached) so you can hopefully find the issue and resolve it. I've also attached two pictures to demonstrate what the bomber looks like when it's working as intended, and when the bombs have prematurely activated.