--map-settings with --start-server-load-scenario

[Oarc]

I'm confused why --map-settings doesn't work when launching headless via cmd line using --start-server-load-scenario.
--map-gen-settings works fine, but not --map-settings.

If I purposefully put an error inside the json file, it fails to load and sees the error. So clearly it's at least parsing the file.
But if I make changes to enemy evolution, for example, they don't seem to take effect.

Any ideas or help please?

FWIW, I'm testing on latest experimental.