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The following workaround can help:

sage: plot(lambda x: sgn(x)*(x*sgn(x))^(1/3), (-5, 5))
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The following workaround can help:

sage: plot(lambda x: sgn(x)*(x*sgn(x))^(1/3), (-5, 5))

One can also use an implicit plot:

sage: implicit_plot(y^3 == x, (x, -5, 5), (y, -2, 2))