Dragon Road Act 2-2 physics difference between 30 and 60 fps

Validation

• I have checked the Issues page to see if my problem has already been reported
• I have confirmed that this bug does not occur in the original game running on original Xbox 360 hardware

Describe the Bug

Physics depends on FPS from the looks of it

Steps to Reproduce

Steps to reproduce the bug:

1. Set FPS limit to 60
2. Go to Dragon Road Day Act 2-2
3. Take the path shown, use only the boost while on the rail, don't touch the analog stick

Expected Behavior

You should hit the spring.

Footage

Bug:

https://github.com/user-attachments/assets/ef7cdb33-6575-4f68-a43c-67a10d030803

Expected (also recorded on the recompiled project. I don't have the means to record 360, but I can record Series X if needed):

https://github.com/user-attachments/assets/2ea2f8d3-6b46-4a64-a7d6-7c9a74fb5961

Specifications

Fill out the following details:

• CPU: Ryzen 7 5800H
• GPU: iGPU (Radeon Vega 8)
• GPU Driver: Mesa 24.3.4-3.fc41
• OS: Fedora 41 KDE Spin
• Version: 1.0.0

Additional Context

When I tested this on Series X, I noticed the same difference between 30fps and 60fps. It does not occur on X360, as it can't hit 60 fps there at all.

Reproduce Dragon Road Day Act 2-2 at 30 and 60 FPS using the reported route and boost-only input, comparing the result with the linked footage. Trace the game's physics and frame-update entry points to identify where the behavior diverges. Done means the path reaches the spring at 60 FPS while preserving expected behavior at 30 FPS.