@marial2019 Are you on a PC/laptop or on a mobile device?
Anyway, on my PC, there is a folder AppData (C:\users(you)\AppData, this is a hidden folder, so you should make it visible (simple, google how to do so). Don't do this, and the next, when you're totally inexperienced or insecure doing things like this. On my PC in Appdata there's a folder Roaming, and in that folder there's a folder Opera Software, with in it a folder Opera Stable. There I found a file History (maybe the exact location may vary, so you might have to look around in your Appdata, however, of course, always in a folder Opera Stable). You might want to copy this file to some 'working' folder.. Since the bug is about accessing history, you might find your youtube link in this file. I opened it with a text-editor like Notepad. You get a lot of incomprehensible characters, but for our purpose just use Ctrl F to find 'youtube'. There will be plenty, but just glance at the link and see if the title of the video rings a bell. Search on untill you find what you were lookin for. When you find it try to copy it, or, probably easier, write it down and search on youtube. This mighf work (unless Opera stopped recording history), but I got links back from june. When you're done, don't save your file, and you might want to make your folder invisible again, it's a safety measure, to prevent you from deleting essential files, by accident or 'ignorance'. Good luck.
PS I don't understand the edit-remark.