So, the rear hatch usually does not unlock via the electric/power door lock/unlock function, when using the key in the driver's door, is that right? But it does sometimes, when using that key in the driver's door?
And, that key does not work in the keyway in the hatch itself, is that right?
The key ought to be the same for that lock as for the others. Hmm; for sedans there was a 'valet' key, which would work in the doors and ignition but not trunk; it was the same pattern but a tad thicker. I don't know about that for wagons though.
Have you tried a different locking relay?
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