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JSON:PP escapes "'" characters, which is not allowed according to RFC 4627 and will cause deserialization errors with other JSON implementations:

$ perl -Ilib -MJSON::PP -MData::Dumper -we "print Dumper(encode_json([\"<<'>>\"]))"
$VAR1 = '["<<\'>>"]';

(The documentation still refers to_json, which has been obsoleted, BTW.)

The solidus escaping an apostrophe is result of Data::Dumper::Dumper(). The JSON::PP::encode_json() does not do that. See simpler case:

$ perl -MJSON::PP -e "print encode_json([qq{'}]), qq{\n}"
["'"]

Ugh, sorry about that.  You are right, of course.  This part of the source code confused me:

    my %esc = (
        "\n" => '\n',
        "\r" => '\r',
        "\t" => '\t',
        "\f" => '\f',
        "\b" => '\b',
        "\"" => '\"',
        "\\" => '\\\\',
        "\'" => '\\\'',
    );

        $arg =~ s/([\x22\x5c\n\r\t\f\b])/$esc{$1}/g;

' is present in the hash, but not in the regular expression.