The lighted case has golden hooks. They obviously lead to some wiring/circuitry under the long attachment placard and then to the light.
The UNlighted case must have scrimped a bit and used some of the same assembly circuitry and somehow the wires are shorting out since they are not and were not intended to connect to the light assembly. Metal or wiring must accidently connect the two hooks together creating a short or intermittent short.
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