Error when trying to compile SASS code

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I'm using Sass for styles. When i try to compile this part of code:

.heart {
  width: $size * 2;
  height: $size * 1.65;
  cursor: pointer;

  &:before {
    position: absolute;
    content: "";
    left: $size;
    width: $size;
    height: $size * 1.65;
    background: #fff;
    border-radius: 50px 50px 0 0;
    transform: rotate(-45deg);
    transform-origin: 0 100%;
  }
  &:after {
    @extend .heart:before;
    left: 0;
    transform: rotate(45deg);
    transform-origin :100% 100%;
  }
}

I got this message:

@extend .heart:before;
Error: compound selectors may longer be extended.
Consider `@extend .heart, :before` instead.
See http://sass-lang.com/documentation/file.SASS_REFERENCE.html#extending_compound_selectors for details.

@extend .heart:before;

It doesn't compile with terminal, but it's compile and works as expected with Prepros application. Any ideas why it doesn't work when i try to compile with sass command?

I used this example: https://codepen.io/souporserious/pen/yEntv

J Quest

I think you need to create a placeholder like this; Also I know that there are some bugs in command line compiling with @extand and pseudo-elements around 2016.

%placeholder {
    position: absolute;
    content: "";
    left: $size;
    width: $size;
    height: $size * 1.65;
    background: #fff;
    border-radius: 50px 50px 0 0;
    transform: rotate(-45deg);
    transform-origin: 0 100%;
}

.heart {
  width: $size * 2;
  height: $size * 1.65;
  cursor: pointer;

  &:before {
    @extend %placeholder;
  }
  &:after {
    @extend %placeholder;
    left: 0;
    transform: rotate(45deg);
    transform-origin :100% 100%;
  }
}

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