Broken @keyframes in symbol definition

[PawelGIX]

It seems that @Keyframes are removed from output.

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
     viewBox="0 0 50 50" width="50" height="50" style="enable-background:new 0 0 50 50;" xml:space="preserve">
<style type="text/css">
   .st0{fill:#58BB6A;}
  .st1{fill:none;stroke:#58BA6A;stroke-width:2;stroke-miterlimit:10;}
  .draw {
    stroke-dasharray: 22;
    stroke-dashoffset: 22;
    animation: dashAnim 1s  linear  both;
  }
  @keyframes dashAnim {
from{ stroke-dashoffset: 22;}
to{ stroke-dashoffset: 0; }
}
</style>

    <path class="st0 " d="M24.8,45.4c-11.3,0-20.5-9.2-20.5-20.5S13.5,4.4,24.8,4.4c11.3,0,20.5,9.2,20.5,20.5S36.1,45.4,24.8,45.4z
             M24.8,6.2C14.5,6.2,6,14.6,6,24.9c0,10.3,8.4,18.8,18.8,18.8s18.8-8.4,18.8-18.8C43.6,14.6,35.1,6.2,24.8,6.2z"/>

    <polyline class="st1 draw" points="18.2,24.6 22.8,29.2 30.8,21.3 "/>

</svg>

is converted to:

<symbol viewBox="0 0 50 50" id="input-success"><style>.arst0{fill:#58bb6a}
.arst1{fill:none;stroke:#58ba6a;stroke-width:2;stroke-miterlimit:10}
.ardraw{stroke-dasharray:22;stroke-dashoffset:22;animation:dashAnim 1s linear both}
@keyframes dashAnim{0%}
</style>
<path class="arst0" d="M24.8 45.4c-11.3 0-20.5-9.2-20.5-20.5S13.5 4.4 24.8 4.4s20.5 9.2 20.5 20.5-9.2 20.5-20.5 20.5zm0-39.2C14.5 6.2 6 14.6 6 24.9c0 10.3 8.4 18.8 18.8 18.8s18.8-8.4 18.8-18.8c0-10.3-8.5-18.7-18.8-18.7z"/>
<path class="arst1 ardraw" d="M18.2 24.6l4.6 4.6 8-7.9"/></symbol>