Opera web browser 106.0.4998.19 in LXDE 11 on Ubuntu 22.04 (freshly updated) has some issues with the main and all the context menu border transparency. Instead of the transparent background, there is a solid white border and a black shadow. I got the embedded video in my Intel Core i7-8700. This appearance has been tested with the hardware acceleration feature switched on and off - no difference.
See the Opera browser issues' in LXDE screenshots below:
All these menus look well with proper border transparency when I switch to Gnome 42.9 on the same PC. So I guess there may be some Gnome libs that could be loaded somehow when working in LXDE 11, but I don't know how to do this, and Google has told me nothing certain.
What could be done to get the proper Opera menu border transparency in LXDE?