Tried to do a simple slideshow that I could use as a browser source on my stream. It would show every image within a folder, it would keep looping until it tries to load an image that does not exist, then goes back to the first one.
Chrome does show file not found error for local images:

I used an eventListener to look for when this happens:
selector.img.addEventListener("error", function () {
console.log("error");
});
And it works just as intended, it goes back to first image, no problems. Except when using BrowserSource. It goes to the last image but it won't fire the image "error" event.
Also, logging in with the remote debugger on OBS does not log any file not found

I've used both "load" and "error", but only "load" seems to work. Was this purposefully removed or is it unintended?