@litlightbulb Yes, for the reason Leo said. There might be a way to get the icons to load again by loading each of those bookmarked pages.
But, while Opera is closed, you could instead try to edit the "Bookmarks" file in Opera's profile folder directly with a text editor. Since you wouldn't be changing the guids, the favicon_urls and imageIDs that point to the data in the Bookmarks Extra file, it might work (as long as Opera doesn't have any protections on modifications to the file).
Do you mean open a new blank tab or do you mean open a link in a new tab? Imgur does not seem to work very well any more. I could not see your image there. Opening a link in a new tab works for me with middle-click. I can also close a tab with middle-click.