Circuit tester showed open ground. A ground wire is bent back and attached to metal box but not outlet. Is this safe to use? 1975 house if that matters. : r/AskElectricians

Bootleg ground or false-ground on 3-prong receptacles. - Charles Buell Consulting LLC

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Receptacle Tester - Ideal for 110-125 VAC 3 wire receptacles. Tester indicates: Open ground, open hot, open neutral, hot/ground reverse, hot/neutral reverse and correct - By Katzco

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What Is An Open Ground? Waypoint Inspection Property Inspection