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This is not an answer, but I need markup - this is @Dirk Danckaert's example in pure Maxima.

(%i1) declare(w,real);
(%o1)                                done
(%i2) assume(w<0);
(%o2)                               [w < 0]
(%i3) limit(log(w+%i*eps),eps,0);
(%o3)                                 und

(that is, undefined)

(%i4) limit(log(w+%i*eps),eps,0,plus);
(%o4)                           log(w) + %i %pi

so the problem is in Maxima, if they would consider it a problem.