Adobe Illustrator CC 23.0.3, Mac OS 10.14.6(Mojave)

Step To Reproduce issue:

1) create one HTML5 extension.

2) Display images on extension(you can display images from you local disk with html tag <img>)

3) try to drag & drop image from extension to Browser/desktop(on browser you can use google image search dropbox).

Expected Result : Image should be dropped at google image search/desktop(In html cep cookbook clearly mentioned that drag & drop between extension and browser/desktop supported).

Current Result : Image is not getting dropped.

Note: same use case is working fine on windows os

Attached video: