To confirm the original poster's observations, this still exists as of August 2018. Removing libjson-xs-perl causes libcpanel-json-xs-perl to be installed instead, and per https://rt.cpan.org/Public/Bug/Display.html?id=94784 and discussion in https://forum.bestpractical.com/t/perl-upgrade-on-debian-9-causes-json-error/31524/5 this works.
It would be nice if this weren't broken out of the box. Making this package substitution would do the trick. Thank you. -- The creatures outside looked from pig to man, and from man to pig, and from pig to man again; but already it was impossible to say which was which. - G. Orwell
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