Boostrap.css on node_modules has unclosed blocks

[tfcb93]

I was trying to compile a work and I got this message:

ERROR in ./node_modules/css-loader/dist/cjs.js??ref--2-1!./node_modules/postcss-loader/lib??ref--2-2!./node_modules/resolve-url-loader??ref--2-3!./node_modules/sass-loader/dist/cjs.js??ref--2-4!./node_modules/bootstrap/dist/css/bootstrap.css
Module build failed: Syntax Error 

(4664:2) Unclosed block

  4662 | 
  4663 | .navbar-light .navbar-toggler-icon {
> 4664 |   background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 0, 0, 0.5)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
       |  ^
  4665 | }
  4666 | 

 @ ./node_modules/bootstrap/dist/css/bootstrap.css 4:14-221 18:2-22:4 19:20-227
 @ ./src/index.js
 @ multi (webpack)-dev-server/client?http://0.0.0.0:3000 webpack/hot/dev-server babel-polyfill react-hot-loader/patch webpack-dev-server/client?http://0.0.0.0:3000 webpack/hot/only-dev-server whatwg-fetch ./src/index
Child html-webpack-plugin for "index.html":
     1 asset
    [./node_modules/html-webpack-plugin/lib/loader.js!./index.hbs] ./node_modules/html-webpack-plugin/lib/loader.js!./index.hbs 716 bytes {0} [built]
    [./node_modules/lodash/lodash.js] ./node_modules/lodash/lodash.js 541 kB {0} [built]
    [./node_modules/webpack/buildin/global.js] (webpack)/buildin/global.js 509 bytes {0} [built]
    [./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 517 bytes {0} [built]
webpack: Failed to compile.

I went to the bootstrap.css file and deleted the class and got another one:

ERROR in ./node_modules/css-loader/dist/cjs.js??ref--2-1!./node_modules/postcss-loader/lib??ref--2-2!./node_modules/resolve-url-loader??ref--2-3!./node_modules/sass-loader/dist/cjs.js??ref--2-4!./node_modules/bootstrap/dist/css/bootstrap.css
Module build failed: Syntax Error 

(4709:2) Unclosed block

  4707 | 
  4708 | .navbar-dark .navbar-toggler-icon {
> 4709 |   background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.5)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
       |  ^
  4710 | }
  4711 | 

I also deleted this one and now everything works perfectly.

I notice that on issues like #25211 people said to override the classes with other stuff, but this didn't work for me. I think this is somehow related to #25521 too.
Well, I don't think to delete files on bootstrap.css is a good solution. I hope this can be fixed or clarified soon.
Thanks for your attention.