CMS Dataset gone missing after refreshing the editor

Question:
Wix datasets gone missing upon refreshing the page. (I need to know how to fix this one asap -.-)

Product:
Wix Classic Editor

What are you trying to achieve:
I just normally try to add function into onReady() of the dataset. Since it’s not added (seems like another bug.), I tried to refresh the editor. When I’m back to that page, every dataset is gone as show in the screenshot.

What have you already tried:
I tried to add a new dataset. It’s not appearing as well.

Additional information:
I put the datasets in the place of the red rectangle box.

I just contacted with a Wix expert.
It’s the new feature for a better experience.
Click CMS icon → Stay in Main and Click “Manage Page Connections” and browse your dataset and continue changing the setting of the dataset.