Any limitations on what can be dragged inside the Tab Component

Hi, Is there any limitation/bug with the Tab Component?
I have tried every possible tricks I can think of but I cannot drag anything inside the Tab #2 or Tab #3. It alway end outside the component
I even tried it on a blank page.
Any help will be welcome.

You need to switch to that Tab first

I am not sure what you mean?

Either go to preview mode and click on the tab you want to edit before you edit it, or select Tab element and go to the Settings and select the tab you want to edit