Jet Force Gemini freezes when trying to load the character selection area

[Roboguy420]

Describe the bug
Jet Force Gemini has a consistent freeze, seemingly when trying to load the character selection area.

To Reproduce
Either:

1. Create a new save file
2. Let the intro cutscene play out, up to the part where Vela and Lupus are transported to the character selection area
3. Game freeze

Or:

1. Attempt to load a save
2. Game freeze

Expected behavior
The game does not freeze and instead loads the character selection area correctly

Video
Might take a bit to upload but should be viewable eventually
Simple64 JFG Freeze

Desktop:

• OS: Arch Linux
• Version: Build c96e168, v2024.06.2
• GPU: RTX 3060

Additional context
I'm running the US version of the game, and am running a locally-compiled (AUR package) version of Simple64, not Flatpak.
When it tries to load this area, a core error appears in the log saying "Error: reserved opcode: 80009420:4A6D6B54"