When I shut my PC down, Opera only saves the tab island(s) on the workspace I'm in, which can be a problem given I have 400+ tabs open for each workspace, organized into islands to make navigation a bit easier. This left me trying to reorganize a total of 1200+ tabs whenever I needed to restart or shut down my system. My current workaround is to go to Opera Stable/Default/Sessions and Opera Stable/Default/Session Storage and copy the files over to a folder, then replace the root files with the pre-saved version when I boot my PC next. I am not sure why the folder content would be any different after a restart, but it seems to work, even if it is a tad annoying. This seems either like an oversight, a bug, a missed setting on my part or something else entirely, I'm not all that sure. It very well could be my own stupidity, but if there is a fix, it would be beneficial.
I am on:
Windows Version 23H2, Build 22631.3880, 64 bit
Opera One(version: 112.0.5197.39)

I can provide more info if needed, wasn't sure what type of information to provide beyond the basics.