dataTransfer is undefined in Event at onDropDragOver callback.

Describe the bug

Sure, I can return {w: number, h: number} after call onDropDragOver, but when outside items has different size, how can I know it. I have set dataTransfer there, but looks I only can get it at onDrop.

Your Example Website or App

https://codesandbox.io/s/nice-roman-mun30j?file=/src/ShowcaseLayout.js

Steps to Reproduce the Bug or Issue

1. Go to sandbox
2. Drag item
3. Please see message in control panel.

Expected behavior

Develper can get data from dataTransfer in onDropDragOver same as onDrop

react-grid-layout library version

1.3.4

Operating System Version

Windows

Browser

Chrome

Additional context

No response

Screenshots or Videos

No response