Just noticed that the .results class background is not using the new color variables yet. Hence on dark color scheme the search results background is still #ffffff.
Can you add the new variables in the next update?
Meanwhile if anyone else is having same issue, here is my temporary fix:
/* temp fix bg search banner */
.custom-search-banner-wrap .results {
background: var(--secondary)!important;
border: 1px solid var(--primary-low);
}