Doesn't highlight color on rgba less function when using variables/hex

It doesn't highlight the color when you use the rgba less function like this:

`color: rgba(red(#ffffff), green(#ffffff), blue(#ffffff), 0.7);`
or
`color: rgba(red(@color), green(@color), blue(@color), 0.7);`

Note that it **does** work with rgb function but not rgba.

Using ATOM v1.16.0 on Windows 10