(Qt 6.9.3 + emsdk 3.1.70 + qmake)

Through lots of trial and error, I figured out that it's happening when using emscripten::val, or maybe EM_JS, in a .cpp file that is located in a subfolder (relative to the .pro file). Moving the file up to the main directory yields a wasm file that works normally.

Has anyone seen this and have any more details on what's causing it and what is a better fix than moving the file? My .pro file is pretty basic and I don't see any reason the location of the file should matter.