On a Macbook Pro M1 2020, Opera version 82.0.4227.43 (arm64), MacOS 12.0.1 (Arm64), the following issue happens and was not observed on Windows 11 or Macos on Intel Macs.

When I move a tab, within the same window, or outside Opera so it becomes a new window, a ghost of the tab preview thumbnail sometimes remain after the tab was successfully moved. This ghost image stays on top of everything, cannot be closed or moved and prevent from clicking on anything underneath it.
The only way to get rid of it is to force quit Opera.

I have two monitors and often move tabs around, or reorder them within my main window, and this behavior is really annoying.

Thank you for looking into it!