non-`file:` URIs in library/userThirdParty settings don't work

my extension generates a LuaLS userThirdParty bundle dynamically from Factorio's doc files (from the local game install, generally). I'm working on trying to switch to using a virtual FS provider for these files instead of cluttering up real workspace-associated folders with them. I've registered as the provider for fmtk: uris, and i can open all the files for the generated bundle in vscode in editor tabs, but LuaLS won't load them as libraries.

I set

"Lua.workspace.userThirdParty": [
        "fmtk:/luals"
    ],

in my settings.json, instead of setting the generated folder path as i had done previously, but LuaLS seems to have completely ignored it.

I also tried

    "Lua.workspace.library": [
        "fmtk:/luals/factorio/library"
    ],

but that also seems to ignore anything that isn't a plain file path.

Comienza reproduciendo el problema con el proveedor de sistema de archivos virtual fmtk: y las opciones Lua.workspace.userThirdParty y Lua.workspace.library que se muestran en el informe. Traza cómo estas opciones resuelven las rutas de las bibliotecas; se considera terminado cuando las URI que no son URI de archivo se cargan como bibliotecas en lugar de ignorarse, con una prueba de regresión que cubra este comportamiento.