Turrets from Rampant Arsenal ( https://mods.factorio.com/mod/RampantArsenal ) don't receive experience and can't level up.
On a sidenote: Drone Depots from Transport Drones ( https://mods.factorio.com/mod/Transport_Drones ) break when they level up.
-> Skipped entities "request-depot,supply-depot,fuel-depot,fluid-depot" was enough to fix this problem.
