stop_checking_cart.php

<?php

add_filter( 'woocommerce_bookings_in_date_range_query', 'wswp_filter_check_in_cart', 100, 1);

function wswp_filter_check_in_cart( $booking_ids ) {
    foreach( $booking_ids as $key => $booking_id ) {
        $booking = get_wc_booking( $booking_id );
        if ( $booking->has_status( 'in-cart' ) ) {
            unset( $booking_ids[$key] );
        }
    }
    return $booking_ids;
}