When playing multiplayer in Mario Kart 64, certain GUI elements are missing/showing black boxes. The issue is not present in single player.
Screenshot of problem:

How it looks in RMG:

The issue was brought to attention to GlideN64 dev here:
gonetz/GLideN64/issues/2894, and was seemingly resolved on their end, and the issue does not happen in RMG; however issue still persists with latest core build — atleast on my end.
Core Version: 2.8-Vulkan
222acbd
Video Driver: glcore
RDP: GlideN64
Game options:
mupen64plus-EnableInaccurateTextureCoordinates = "False"
mupen64plus-EnableLegacyBlending = "True"
mupen64plus-EnableLODEmulation = "True"
mupen64plus-EnableTexCoordBounds = "True"
mupen64plus-EnableTextureCache = "True"