60 FPS Patch causes stuttering on Endless Stairs

[teconmoon]

Describe the bug
Utilizing the 60fps patch, the endless stairs exhibits weird flickering on the Bowser/Peach portraits when the stair loops.

To Reproduce
Steps to reproduce the behavior:

1. Compile the game including 60fps_ex.patch
2. Go to the endless stairs with less than 70 stars
3. Attempt to climb the stairs and watch the portraits flicker as the stair loops

Expected behavior
The portraits should not flicker as the stair loops

Screenshots
60 FPS: (Issue Shown)
https://github.com/sm64pc/sm64ex/assets/46909426/4fd7be3c-7e17-4df9-830b-d6bfc47bff7a

30 FPS: (No Issue)
https://github.com/sm64pc/sm64ex/assets/46909426/d4520a5d-9133-47c9-8b06-1594ddf37d99

Desktop (please complete the following information):

• OS: Windows 11 Pro
• Browser: Chrome
• Version: 22H2

Additional context
This issue doesn't occur in native 30 FPS.