Trying to fix plugins using EntityDamageEvent

Hi, I have a problem with both Worldprotect and PeacefulSpawn that don't seem to be able to disable pvp since the update. The code is very simple for both, and I can't see any reason why the pvp restriction feature of both these plugins won't work with PHP7 and recent API 2.0.0 builds, unless there's now some problem cancelling the EntityDamageEvent? Thanks for any help

Code:

    public function onPvP(EntityDamageEvent $ev) {
        if ($ev->isCancelled()) return;
        if(!($ev instanceof EntityDamageByEntityEvent)) return;
        if (!(($pl = $ev->getEntity()) instanceof Player
                && $ev->getDamager() instanceof Player)) return;
        $world = $pl->getLevel()->getName();
        if (!isset($this->wcfg[$world])) return;
        if ($this->wcfg[$world] !== false) {
            $sp = $pl->getLevel()->getSpawnLocation();
            $dist = $sp->distance($pl);
            if ($dist > $this->owner->getServer()->getSpawnRadius()) return;
        }
        $this->owner->msg($ev->getDamager(),mc::_("You are not allowed to do that here"));
        $ev->setCancelled();
    }

Theres an issue with the client not sending the event