I have the same issue. The icon is there, but its opacity is set to zero, so it’s not visible.
.cooked h1 a.anchor, .cooked h2 a.anchor, .cooked h3 a.anchor, .cooked h4 a.anchor, .cooked h5 a.anchor, .cooked h6 a.anchor, .d-editor-preview h1 a.anchor, .d-editor-preview h2 a.anchor, .d-editor-preview h3 a.anchor, .d-editor-preview h4 a.anchor, .d-editor-preview h5 a.anchor, .d-editor-preview h6 a.anchor
Specificity: (0,2,2)
{
opacity: 0;
transition: opacity .25s;
}
I cannot see the icons in the OP either, so that rules out any custom styling on my instance.
I’m using Chrome.