I can not use collapseEmptyDivs and onSlotIsViewable.

[mind-chn]

1. my code
   <DFPSlotsProvider dfpNetworkId='223513049' collapseEmptyDivs>
   and I put onSlotRender={dfpEventData => console.log('slot 1', dfpEventData)} it's showed
   {slotId: "div-apt-ad-H4YaImS13r", event: cu} event: cu {slot: Zb, serviceName: "publisher_ads", isEmpty: true, slotContentChanged: true, size: null, …} slotId: "div-apt-ad-H4YaImS13r" __proto__: Object
   but dont show the Ads.
   if I dont use this when it's dont have Ads render It's have white space.

And
2. I put onSlotIsViewable={dfpEventData => console.log('slot 1 viewable!.', dfpEventData)} in
But dont have anything in my console :)

Thank for your help. :)