[Bug] mednafen_psx core hangs during load

[SatorSquare]

RomM version
v3.5.1

Describe the bug
The mednafen_psx core for Playstation does not appear to load. The pcsx_rearmed core loads perfectly fine, however trying to load the mednafen core hangs with the following exception in the dev console: Uncaught TypeError: window.EJS_Runtime is not a function

To Reproduce
Steps to reproduce the behavior:

1. Navigate to the Playstation platform
2. Attempt to load a rom with the mednafen core

Expected behavior
The rom should load properly

Desktop (please complete the following information):

• OS: Windows
• Browser: Chrome and Firefox

Additional context
The issue appears with both CHD and PBP files. I have not attempted to test with bin/cue