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I encountered a similar error in v1.18.2 While support for IPv6 was added, support for the IP zone was not, for my application, I simply trimmed the zone information off as follows: line 659+ in /includes/IP.php:

public static function canonicalize( $addr ) {

   $addr = preg_replace('/\%.*/i',,$addr); #line I added to remove zone info

if ( self::isValid( $addr ) ) { return $addr; }