I was able to stop the duplicate icon creation as follows:

1. Open Windows Settings --> Apps --> Default Apps --> Web Browser
2. Change default browser in settings from Opera to another browser and exit
3. Re-open Windows Settings and change default browser back to opera.

I was able to stop the duplicate icon creation as follows:

1. Open Windows Settings --> Apps --> Default Apps --> Web Browser
2. Change default browser in settings from Opera to another browser and exit
3. Re-open Windows Settings and change default browser back to opera.

I have same issue so how long before this is fixed? The whole point of optimized browsing is to eliminate things like ads slowing down page refresh not to mention annoying as heck....Adblocker & adblocker+ do not cause this issue.