"Super Mario Land" displays brief glitch screen after title

• GameBoyEmu

  3 1 0.0 Java

I'm making some progress on my my WIP emulator, it has passed Blargg's instructions and instr_timing tests (but is not accurate to sub-instruction cycle timing and so fails the mem_timing tests), dmg_acid2, and mooneye's MBC1 tests. So far, it seems like it can even play Pokemon and Tetris (albeit silently, as I've not yet implemented sound). Yet, when I try running Super Mario Land, it loads up the title screen seemingly fine, but if I try to start the game, it briefly displays the below screen, then returns on its own to the title screen:

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