Question: Bug in Physics package

Here is the minimal working example: 

with(Physics):
Setup(noncommutativeprefix={W,V});
simplify(W^(-1)*(-W^(-1)-W*V^(-2)));

 

It gives the result  below, which is wrong. Or am I misinterpreting? (Maple 2018)

 

(-V^2-W^2)*(1/V^2)*(1/W^2)

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