Angular 12: ng build fail with undefined:5:64672: property missing ':'

[cesco69]

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• extract-i18n
• run
• config
• help
• version
• doc

Is this a regression?

yes

Description

> ng build --configuration production

✔ Browser application bundle generation complete.
✔ ES5 bundle generation complete.
✔ Copying assets complete.
✖ Index html generation failed.
undefined:5:537096: property missing ':'

🔬 Minimal Reproduction

I have opened the styles.1934fdd50a80704deb3a.css file and at line 5 column 537096 there is this class:

.mx-icon {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3C%3Fxml%20version%3D%221.0%22%20encoding%3D%22utf-8%22%3F%3E%0A%3C!--%20Generator%3A%20Adobe%20Illustrator%2024.0.1%2C%20SVG%20Export%20Plug-In%20.%20SVG%20Version%3A%206.00%20Build%200)%20%20--%3E%0A%3Csvg%20version%3D%221.1%22%20id%3D%22dx_l_3%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%20x%3D%220px%22%20y%3D%220px%22%0A%09%20width%3D%2224px%22%20height%3D%2224px%22%20viewBox%3D%220%200%2024%2024%22%20style%3D%22enable-background%3Anew%200%200%2024%2024%3B%22%20xml%3Aspace%3D%22preserve%22%3E%0A%3Cpath%20style%3D%22fill%3Argba%280,%200,%200,%200.54%29%3B%22%20d%3D%22M12%2C2C6.5%2C2%2C2%2C6.5%2C2%2C12c0%2C5.5%2C4.5%2C10%2C10%2C10s10-4.5%2C10-10C22%2C6.5%2C17.5%2C2%2C12%2C2z%20M18%2C13H6v-2h12V13z%22%2F%3E%0A%3C%2Fsvg%3E%0A");
  background-size: 100%;
}

the colum 537096 is exactly on

background-image: url("data:image/svg+xml;charset=
--------------------------------------------------^

🌍 Your Environment

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 12.0.0
Node: 12.22.1
Package Manager: npm 6.14.12
OS: win32 x64

Angular: 12.0.0
... animations, cdk, cli, common, compiler, compiler-cli, core
... forms, language-service, localize, material
... material-moment-adapter, platform-browser
... platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1200.0
@angular-devkit/build-angular   12.0.0
@angular-devkit/core            8.3.29
@angular-devkit/schematics      8.3.29
@schematics/angular             8.3.29
rxjs                            6.6.7
typescript                      4.2.4

[alan-agius4]

Duplicate of #20760

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