It is an internal site. But I found a work around if i set style > (Title Settings) > ‘Hover Style’ to ‘heading’ instead of ‘none’ then my a.visited in the custom.scss does work again.

Debugging info
Settings the color in the particle is still needed else it will get the color from /custom/css/jluikit.min.css

.jl-h1, .jl-h2, .jl-h3, .jl-h4, .jl-h5, .jl-h6, .jl-heading-2xlarge, .jl-heading-large, .jl-heading-medium, .jl-heading-small, .jl-heading-xlarge, h1, h2, h3, h4, h5, h6 {
    margin: 0 0 20px 0;
        margin-top: 0px;
        margin-bottom: 20px;
    color: #f20b0b;  <this is a test color
    text-transform: none;
}

and if i disable that it will fallback to: /custom/css-compiled/hydrogen_20.css?5ea975e9

h1, h2, h3, h4, h5, h6, strong {
    color: #313131;
}

after that a fall back to g-side and then body but the are all blackis instead of accent1

<h3 class="tm-title jl-margin-remove-bottom jl-margin-remove-top jl-h5">
  <a class="jl-link-heading" href="/news/article1" target="_self">article1</a>
 </h3>