@leocg Yeah, now I see it. 'Save as PDF' works as it is supposed to.
Though I still think that HTML save is misleading here and it should be changed.

When you save a page, Opera re-downloads it and saves a fresh version of the page, instead of save the currently loaded page.
It's a big problem, especially when it comes to pages that changes frequently. It's also very confusing, because 'Save' option in every software usually means to save what you already have, but Opera can save completely different content than you actually see (if the page has changed in the meantime).

I noticed this when I saved some tabs loaded a day before to read later, and when I opened the files, they didn't have the content I wanted to save back then.

This really needs to be fixed, or at least, the option should be named 'Download' instead of 'Save' so the user will be aware what this actually does.

Backup folder C:\Users\<your username>\AppData\Roaming\Opera Software (it contains all your preferences and browsing data) and reinstall Opera. First try with keeping user files at uninstall.
If it doesn't help, do clean uninstall and, after install, run and close Opera, replace Opera Software folder with the one from backup and run Opera again.

Don't delete your backup until Opera works properly.

In private window, page icons (favicons) are replaced with incognito icons. It's a remnant of an old Opera 12, where private tabs were in the same window as the normal tabs, so marking private tabs with separate icon helped distinguish them.

In the new Opera, it doesn't make sense to mark each private tab as private, because private tabs can only exist within separate (private) window. In this case, it is enough to mark only the window as private - which is already done by different address bar/window color.

Please consider removing this icon replacement. Removed page icons really make browsing difficult, especially when working with many tabs. Opera is the only browser with this pointless 'feature'.