file-replacements not work in scss

[xiaoxiangmoe]

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
• version
• doc

🔬 Minimal Reproduction

https://github.com/xiaoxiangmoe/angular-file-replacements-scss-error

Description

run yarn start -c serve

"serve":{
  "fileReplacements": [
    {
      "replace": "src/app/app-color.ts",
      "with": "src/app/app-color-replace.ts"
    },
    {
      "replace": "src/app/_app-color.scss",
      "with": "src/app/_app-color-replace.scss"
    }
  ]
}

fileReplacements in ts works, but fileReplacements in scss don't work.

If it works, the color should be green.

[alan-agius4]

Duplicate of #11451

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