This sounds to me more like the neck knife sheath didn’t have enough retention, rather than a general problem with neck carry.
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Yup. I have owned a few knives like this over the years, I have never worn them like that just because of that reason. But they were neat little blades.
I have one. It’s for camping but honed like a kitchen knife for meal prep in the field.
It’s surrounded by a very substantial sheath.