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I’ve found a couple plugs “upgraded” to 3-prong by jumping the load and ground together. That made for a fun firework show when my metal fan touched something metal. Even the landlord was impressed by that stupidity.
Ah, the good old reverse polarity bootleg ground.
Fun fact: RPBG is the one fault that those plug-in outlet testers can’t recognize
Edit: Wait, no, that would be hot bootleg ground, they should catch that. RPBG has the hot and neutral switched, and also a bootleg ground to the neutral that’s actually hot
Seems you understand what needs to be done