Emscripten builds fail to load assets/unzip content

[thelamer]

https://web.libretro.com/
Pick Medafen PCE fast, run, and watch the console.

The files are in the browserfs 100% you can even browse to them using "load content". I am also 100% sure this is not a race condition thing, I have a local setup with await logic that works with many other cores. If you put a config there it reads it, but something about these files is not loading properly.
This behavior also kills the ability to load a zip file (raw chd and pce works fine) and the frontend files being loaded via browserfs don't have any of that logic so it has to be some kind of build time linking when the bc file is generated. Kinda over my head here, not really sure where to start looking to fix this.