Add this as Custom CSS to remove the dark overlay for images in card property unit

.listing_main_image_photo_slider_item .price_unit_wrapper,
.blog_unit_back .price_unit_wrapper,
.property_unit_v3 .price_unit_wrapper,
.wide_property .price_unit_wrapper,
.property_unit_v1 .price_unit_wrapper,
.property_unit_v2 .price_unit_wrapper{
background-image: none;
opacity: 0;
}

Note – The CSS was verified for card type 3