Make sure that your ground is not hot. I found so receptacles in my house that were apparently wired in reverse (according to a receptacle tester). In reality, some had connected the ground for that are to the live wire with no connected to actual ground. As a result, the ground and live are at the same voltage and there's a 120V difference between ground and neutral. This shows up on a tester as reversed. I struggled to believe that someone would do that, but there it was before my eyes.
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