Parsing css files containing nested elements not working

[fen-git]

Extension do not parse css files containing nested elements
Tested it with these few lines. Parsing is successful when nested elements are removed

.testclass{
    display: flex;
    flex-wrap: wrap;
}

.nestParent{
    position:relative;
    width:100%;

    .nestChild{
        position: absolute;
        top:0;
        left: 0;
    }
}