Why does the general-sibling combinator allow toggling pseudo-element’s content, but not the adjacent-sibling?

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Bug Work Around

Apparently, certain valid pseudo-classes chained together allows it to work.

These work (see Fiddle #1, Fiddle #2, Fiddle #3):

#switch:checked + nav:only-of-type + label::before
#switch:checked + nav:nth-of-type(1) + label::before
#switch:checked + nav:nth-child(2) + label::before

This did not (see Fiddle #4):

#switch:checked + nav:not([class]) + label::before

I tried some other :not() combinations, none of which allowed it to work.

** Best choice **

#switch:checked + nav:nth-child(n) + label::before

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