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For something like GBA (I'm going to use mGBA as an example, which is a fantastic emulator and my favorite choice for GBA emulation), there are plenty of visual/rendering and behavioral bugs. A small handful of generally niche/unpopular games don't boot at all. There are visual bugs in some pretty popular games though, i.e. this, this, and this. There are often issues with peripheral emulation and wireless features. Some issues are bugs in secondary emulator features like framecapture/recording. Sometimes there are bugs that pop up that are specific to graphics card driver updates.