I have exactly the same problem. PC is Win 7 and Opera has been updated to v86.0.4363.23, but that made no difference. I then tried Recover Opera Settings Only and that reset the the saved tabs to that session. But the next day it did not update and is now frozen on the tabs of a week ago.
I tried the suggested fix disabling Opera Flags and re-starting, but that made no difference.
I have sent a bug report to Opera, but they say they do not acknowledge individual problems, so not sure where to go from here, as it is Very annoying.
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RE: Opera not saving/restoring session properlyOpera for Windows