Its an issue you can rid off by following below:
Switch From Snap to Official .deb
The Snap build is the most common source of session issues.
Remove Snap:
sudo snap remove opera
Download the official .deb from:
https://www.opera.com/download
Install:
sudo dpkg -i opera-stable_*.deb
sudo apt -f install
The .deb version stores profile data normally under:
~/.config/opera/
This alone fixed the issue for many... you can try and tell if it worked or not. I am most probably sure, this will be working for you too.