The launchar was never solid black, the original configuration is little transparency with black background, but there are some bugs when the panel becomes semi-opaque semi-black after an update for example, and to solve this you can just go to the settings with the ALT+Right-Click and select the second option (if I remember right since I am now using Gnome-Shell) and there is an option for this, you just have to choose something like (Use Solid Color), select Black and then make the opacity at 0%.

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