WS2812B LED striphas only one data signal when one pixel dies, the signal cannot pass through,
WS2813 digital LED strip , you can see as updated version of WS2811 addressable LED strip, it has double signals even one signal is broken, others can still work well, because the signal can pass through, please check picture below:
WS2811 is the old version with external IC , it often made to DC12v addressable strip light, has only one signal too but it is mature for many years.
SK6812 is a clone of WS2812B, with IC built-in, usually made to DC5v individually controlled LED strip light.
WS2812B LED chip
WS2813 LED chip
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