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Sage is simply giving you what Singular computes. Indeed, repeating the calculation in Singular gives the same answer. Note that the Singular documentation D.6.15.10 milnor states that milnor returns -1 if it is not an ICIS in generic form (and otherwise it returns the Milnor number).

Unfortunately I cannot judge if something is wrong, because I'm unfamiliar with these localized rings (defined using ds). (Maybe you can explain the calculation.)

If you think something is wrong, you can submit a ticket in Singular's trac.