text-decoration support was added in #857. However, it doesn't prefix for basic values. This can cause inconsistent situations;

span {
  text-decoration: underline dashed;
}

span.underline-only {
  text-decoration: underline;
}

/* after autoprefix */
span {
  -webkit-text-decoration: underline dashed;
  text-decoration: underline dashed;
}

span.underline-only {
  text-decoration: underline;
}

<span class="underline-only">Underlined text</span>

The span would then have a normal solid underline in most browsers, but in safari it will prefer the prefixed one, even though it should be overridden.

For my situation, I'm using a third party design system, and don't manage the bundling/processing myself (create-react-app), which makes it hard to debug and fix myself.

The solution would be to always apply the prefix on text-decoration, or have some global property that prefixes all if it has been prefixed once.