Note: I have reported this to the Miro support team. If you are also experiencing this issue, leave a reply or subscribe to this post for updates.
In both Chrome and Edge on Windows 10 64-bit, the drag-and-drop "icon" is ghosting on boards and the dashboard. This happens on both the Google Image Search app and one of my custom Web SDK apps, built from the sample drag-and-drop code (https://developers.miro.com/docs/add-drag-and-drop-to-your-app).