Zelda I on the NES app has a visual glitch that occurs when transitioning a screen up in Death Mountain

It only happens in one spot near the very top of the world map. When going up, the graphics mess up and do some kind of fading effect. AFAIK, this didn't happen in Animal Crossing, Zelda: Collector's Edition, any of the Virtual Console releases, or on the NES Classic. It only occurs on NSO and it hasn't been fixed in over 7 years since NSO first launched.