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@LWaB
Rule of thumb is thread engagement length should equal the thread diameter.
When testing exactly how tensile capacity increases with increased thread engagement, it turns out that 4 full turns of thread gives virtually 100% strength and anything further doesn’t increase tensile capacity. That is full turns of thread and the first turn is usually reduced height, so only partial engagement. That applies to both bolt and nut.
I would guess that you’ve only got a couple of turns actually engaging, given the integrated washer under the nut.