Thanks for the report — we've forwarded this to the product team for investigation.
Regarding restoring data, you can recover your lost data using one of the following methods:
If Sync is enabled: Your data will restore automatically upon logging back in.
If you have a device backup: If your phone backed up(e.g., via Google Android Backup), you can restore them by reinstalling the app. Long-press the Opera icon > select App Info > Uninstall. Once you reinstall Opera, the backup data will populate automatically..
Thanks again for helping us improve Opera for Android.