On the one hand I do believe that a newtron star is able to host an Earth Like body.
On the otherhand I don't believe it is suitable for human life just because of the radiation
which is one of the most important features of a newtron star.
(Otherwise overcharging the FSD wouldn't have any snese).
Hence I would suggest to mark those worlds in their description with a small hint.
(HIGH STELLAR RADIATION)
Regards,
Miklos