Seems to happen with Lumiere autons, I'll try to verify with other autons.
Pretty much seems quite RNG whether or not an auton is salvaged as non-deployable or not, decided when the auton is salvaged
Also, it's possible to min-max the salvage value of any auton by stripping it of shields and weapons, and replacing the armour with cheap stuff, not sure if that's intended
Plus, repairing damaged armour segments (to sell) on the fly is great

I need to test if having a damaged armour segment makes it repairable / this issue fixable at an auton shop
EDIT: works, but this resets the auton to its base stats. Rip upgraded armour + shields + weapon