Posts shortcode: IN, NOT_IN, AND

I have the same issue, here is the code that deals with the operators, I am working through this code to see if I can find a fix

// Code from ‘shortcodes.php’, lines 1265 – 1303

// If taxonomy attributes, create a taxonomy query
		if ( !empty( $taxonomy ) && !empty( $tax_term ) ) {
			// Term string to array
			$tax_term = explode( ',', $tax_term );
			// Validate operator
			if ( !in_array( $tax_operator, array( 'IN', 'NOT IN', 'AND' ) ) ) $tax_operator = 'IN';
			$tax_args = array( 'tax_query' => array( array(
						'taxonomy' => $taxonomy,
						'field' => ( is_numeric( $tax_term[0] ) ) ? 'id' : 'slug',
						'terms' => $tax_term,
						'operator' => $tax_operator ) ) );
			// Check for multiple taxonomy queries
			$count = 2;
			$more_tax_queries = false;
			while ( isset( $original_atts['taxonomy_' . $count] ) && !empty( $original_atts['taxonomy_' . $count] ) &&
				isset( $original_atts['tax_' . $count . '_term'] ) &&
				!empty( $original_atts['tax_' . $count . '_term'] ) ) {
				// Sanitize values
				$more_tax_queries = true;
				$taxonomy = sanitize_key( $original_atts['taxonomy_' . $count] );
				$terms = explode( ', ', sanitize_text_field( $original_atts['tax_' . $count . '_term'] ) );
				$tax_operator = isset( $original_atts['tax_' . $count . '_operator'] ) ? $original_atts[
				'tax_' . $count . '_operator'] : 'IN';
				$tax_operator = in_array( $tax_operator, array( 'IN', 'NOT IN', 'AND' ) ) ? $tax_operator : 'IN';
				$tax_args['tax_query'][] = array( 'taxonomy' => $taxonomy,
					'field' => 'slug',
					'terms' => $terms,
					'operator' => $tax_operator );
				$count++;
			}
			if ( $more_tax_queries ):
				$tax_relation = 'AND';
			if ( isset( $original_atts['tax_relation'] ) &&
				in_array( $original_atts['tax_relation'], array( 'AND', 'OR' ) )
			) $tax_relation = $original_atts['tax_relation'];
			$args['tax_query']['relation'] = $tax_relation;
			endif;
			$args = array_merge( $args, $tax_args );
		}