I have encountered similar problem after this update (my customization - color scheme, wallpaper etc was reseted)

I am not aware enough to solve your or even mine problem but I I may suggest:

You can search for some of theese tabs in search history (If possible)
You can export passwords from different browser or same browser on diffrent device (If you have one)

Hope that I at least partialy helped in something

(Windows 10, latest opera gx version)

After new update I keep encountering one same problem I have usually around 20-40 tabs opened and divided in 5 different workspaces (these tab groups on left panel), when Im using my browser from time to time whole app crashes and restarts. After that all of my tabs are mixing. Its not allyways exacly the same but usually they may go all to first workspace or complietly different one, change order in wich they were set or open up again tabs that I already have closed hours ago.

I have never encountered that before an update, first time it happend was around same day of my browser updating.

Bellow I attach screenshots of crashlog and the thing that happends after crash (all tabs in main workspace)

I use Windows 10 and latest opera gx version, Opera gx update changed my browser to new graphic design, and changed my customization (theme, wallpaper etc.) using widgets tab I went back to old look, after it my color sheme went back to one i set before but wallpaper did not, It is not in recently used, I searched for this wallpaper at: https://addons.opera.com/pl/wallpapers/

I went trough every single one opera gx wallpaper but I was unable to find it, tried using google lens to find that wallpaper in other sources but It also failed, the only evidence of existence of that wallpaper I have is this frame cut from me recording my pc and this screenshot

I would appreciate if anybody would find that wallpaper, told me the name, found wallpaper link/file or at least found the way to go back to it

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