The problem somehow laid with Vulkan support not being activated in both the Sea Islands/Southern Islands series. I have tested it with the crowd setting turned to 'low' and it seems that activating Vulkan support by add...
At the moment, I really can't as I don't want to be breaking anything in Fedora, and that it is my main machine -- being that it is almost a rolling release (in a sense). But I will definitely post results when Mesa 19.3...