Bug SASS source files are being stripped

[cherryland]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

SASS source files should be included

What is the current behavior?

SASS source files are being stripped when building from Git repository source

What are the steps to reproduce?

$ npm run build

[devversion]

Thanks for the issue. This is a known issue and will be resolved in #3661

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