Fires express their flame as particle emitters rather than a glow card, and
the emitter path that turns those into a light was gated on lantern-like
models — so a fireplace full of burning wood lit nothing at all and had no
light to flicker. Open flame now takes that path too, with a wider, oranger
light than a candle wick, and forges are classified as the contained fires
they are. All of it guts with the same slow rhythm as the lanterns.