Multiple classses in class attribute not prefixed when using classPrefix

[a10k]

<svg>
<style type="text/css">
    .st0{...}
    .st1{...}
</style>
<path class="st0 st1"/>
</svg>

Webpack: require("svg-inline?classPrefix=TEST!img.svg")

Current result: <path class="TESTst0 st1"/>
Expected result: <path class="TESTst0 TESTst1"/>