OS: Windows 10 Pro 64-bit
CPU: AMD Ryzen 5 3600 / 64 GB RAM
GPU: Radeon RX 5700
Yuzu Version: 737
Seems to be unique to Super Smash Brothers ultimate.
Gameplay, sound, and frame rate are not affected.
Other stages suffering the same problem are marked with a red X in the screenshot.
It appears only the battlefield and Final Destination forms of Spear Pillar are affected.