michaelgr22

After adding the (exact same) code for the breadcrumb from the original style.css to the style.css of my child theme it worked. I wonder if this is the best solution, but I think it’s a good workaround.

.breadcrumb-item + .breadcrumb-item::before {
    border: solid;
    border-width: 0 .1em .1em 0;
    content: "";
    display: inline-block;
    margin-right: .5rem;
    padding: .15em;
    transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
    vertical-align: .15em;
}