The immediate reason is that maxima returns:
Principal Value
(%o4)                                  2

and Sage since #7377 (7 years ago) catches "Principal Value" and makes it 
divergent.
See https://trac.sagemath.org/ticket/7377 for reasons this was introduced.
There are tickets that urge to fix this:

https://trac.sagemath.org/ticket/13511
https://trac.sagemath.org/ticket/17608

So it's a Sage bug in the Maxima interface.

Regards,

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