Apparently there's some options that show on BSS for the 'justify-content' property that do not conform with the flex standard: https://www.w3.org/TR/css-flexbox-1/#justify-content-property
The options should be: flex-start | flex-end | center | space-between | space-around
Are the other options BSS custom?
The space-* options do not show until I start typing them.