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As far as I can tell, this seems to be a bug. uu evaluates to the expression e*expintegral_e(1, 1) and the expintegral_e function doesn't seem to be defined. There is a exponential_integral_1 function which seems to give the correct answer:

sage: N(e*exponential_integral_1(1), digits=18)
0.596347362323194107

This agrees with WolframAlpha.