-FPS Launch command no longer works in 4.11

I’ve added the launch commands: -BENCHMARK and -FPS 1

By my understanding (and what used to happen in previous versions), this should make the game run at a fast speed (since it only has to render 1 frame per second of gametime).

It doesn’t seem to do it anymore. The benchmark command does seem to work, except it appears to be forcing the normal framerate and ignoring the -FPS option.

Is this a bug or has the command FPS launch option changed?