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My guess would be that the electrician hooked the load neutral wire (going to the spa) to the buss bar instead of the GFCI breaker itself. You should have a neutral pigtail (White) coming out of the bottom of the GFCI and another Neutral coming out from right under that. The pigtail and the line neutral (coming from the house) should be the only neutrals connected to the buss bar.
Still no reply from the electrician on getting an inspection but I dont see how this will pass...