Image upload by copy & paste overwrites previous ones

The problem back again, using xwiki 9.4. The bug shows up in chrome and IE, however firefox worked properly.

When copy & paste an image in CKEditor the editor will upload the image as an attachment .

Steps to reproduce:
1. Edit a new page with CKEditor
2. Copy an image from internet (for example, in Chrome, right click a picture and select Copy Image)
3. Paste the image in CKEditor by Ctrl + V or Cmd +V
4. The image is uploaded and saved as attachment called image.png
5. Repeat step 2-3 with another image
6. The new image is uploaded and also saved as image.png which overwrites the previous one. You will see two identical images in the editor.