Has to be a problem with the cluster itself or the power wiring to it. Fuses 13 and 31 both feed a whole lot of other devices in the car, so if it was a generic issue with either circuit, a whole lot of other things wouldn't work. There are two connectors on the back of the cluster, the smaller one has both power connections:
https://drive.google.com/file/d/1BW-TcH ... sp=sharing
The view is harness side, so you're looking at the connector from the side the wires enter. You should see power at all times on pin 46 white, power with the ignition on at pin 44 beige, and good grounds on pins 43 and 45 black. If that all tests okay, then your cluster is bad.