Codekit 2 project in Codekit 3 not recognising Bourbon mixin

[MikeHarrison]

Quick, short summary:
I have added a Codekit 2 project to Codekit 3, which uses Bourbon and Neat using the built-in Codekit @import. I made a change to an SCSS file and hit save. Libsass is throwing an error and the SCSS is not compiling.

Expected results:
SCSS compiles. Dance.

Actual results:

Libsass: Error: no mixin named transition

       Backtrace:
       	Volumes/Data/g Websites/newgatewatches/newgate-watches/src/scss/components/_ribbon.scss:34
        on line 34 of Volumes/Data/g Websites/newgatewatches/newgate-watches/src/scss/components/_ribbon.scss
>>   @include transition(all 0.15s ease);
   -----------^

Your configuration (any details about your system that you think might be relevant)
Mac OS Sierra V10.12.1

[MikeHarrison]

Never mind just seen Codekit is using Bourbon 5 where that mixin is deprecated.