when the skill accelerated furnace is on, furnace emits particles, but there is no fire in it.

mc 1.20.1

This is intended behavior and is used to show which furnaces are affected.

这是预期行为，用于显示哪些炉子受到影响。
粒子存在是用来显示哪些炉子受到影响，但同时熔炉的燃烧状态会消失，也就是说熔炉被影响之后燃烧只会产生粒子而不会有燃烧动画。