Wappler Theme Manager: Color preview doesn't work with SCSS variables

[Apple]

Wappler v5.6.0

1. Define advanced variable $blue:
   

   
   
   (intentionally set blue to dark gray for demonstration purposes)

2. Define primary color to $blue:
   

   

3. Wappler UI didn’t update color preview to match the color of variable $blue

Context: Trying to port a Bootswatch theme to Wappler’s Theme Manager

$primary:       $blue !default;