"block-opening-brace-space-before" problem

[meltifa]

i set "block-opening-brace-space-before": "always"

before run stylefmt

@at-root .content {
	padding-bottom: 20px;
}

after run stylefmt

@at-root .content{
	padding-bottom: 20px;
}

no space in opening brace before.
when i remove @at-root, it is work fine.