Steps to reproduce

Copy/paste the below content into any tesp page , save it and try to edit it again via CKEditor

[[image:data:image/gif;base64,,R0lGODlhDgAOAIAAAAAAAP///yH5BAAAAAAALAAAAAAOAA4AAAIMhI+py+0Po5y02qsKADs=||data-widget="uploadimage"]]

Actual result

You'll get the infinite spinner without an option to edit the page.

Expected result

You can edit the page without issues.

Note

The workaround is either to remove the above content via Wiki-mode editor, or either wrapped it into comment tags, or remove the last element

data-widget="uploadimage"