@dravencrow In my case, the open tabs are not even showing 😂
I think it's a bug...
As an alternative I tried using "Pinboards". The feature is more reliable compared to the previous one (workspaces), but for the amount of tabs I need to keep saved, even opening Pinboards causes a tremendous increase in memory consumption and it takes a long time to open.
It is more useful and viable than workspaces but it also has its downside.
Because of this, I decided to migrate to Edge, it has a feature similar to the "pinboard" and also has the workspaces feature (but without the flaw that opera presents). On the edge, workspaces act as a new window being opened (literally) and everything in it is saved immediately. I tested it a few times and it is very viable.
Unfortunately, in this aspect Opera left a lot to be desired