temp fix for https://core.trac.wordpress.org/ticket/62786#ticket

src/Objects/Generic_Post_Type.php

@@ -400,7 +400,7 @@ public function get_fields() {
 						/* translators: %s: Object type label. */
 						__( 'Enter a comma-separated list of %1$s %2$s.', 'newsletter-optin-box' ),
 						strtolower( $this->singular_label ),
-						strtolower( $label )
+						false === strpos( strtolower( $label ), strtolower( $this->singular_label ) . ' ' ) ? strtolower( $label ) : str_replace( strtolower( $this->singular_label ) . ' ', '', strtolower( $label ) )
 					),
 					'show_in_meta' => true,
 				),
@@ -626,6 +626,12 @@ protected function prepare_create_post_args( $args ) {
 
 						if ( $term ) {
 							$prepared[] = (int) $term->term_id;
+						} else {
+							$term = get_term_by( 'slug', sanitize_title( $term ), $taxonomy );
+
+							if ( $term ) {
+								$prepared[] = (int) $term->term_id;
+							}
 						}
 					}
 				}
@@ -634,7 +640,7 @@ protected function prepare_create_post_args( $args ) {
 					if ( 'category' === $taxonomy ) {
 						$post_info['post_category'] = $prepared;
 					} else {
-						$post_info['tax_input'][ $taxonomy ] = $prepared;
+						$post_info['tax_input'][ $taxonomy ] = array_unique( array_filter( $prepared ) );
 					}
 				}
 
@@ -666,8 +672,31 @@ public function create_post( $args ) {
 			$post = wp_update_post( $post_info, true );
 		} else {
 			$post = wp_insert_post( $post_info, true );
+		}
+
+		if ( ! is_wp_error( $post ) ) {
+			if ( ! empty( $post_info['tax_input'] ) ) {
+				foreach ( $post_info['tax_input'] as $taxonomy => $tags ) {
+
+					$taxonomy_obj = get_taxonomy( $taxonomy );
+
+					if ( $taxonomy_obj ) {
+
+						if ( empty( $tags ) && ! empty( $tax_object->default_term ) ) {
+							$default_term_id = get_option( 'default_term_' . $taxonomy );
+							if ( ! empty( $default_term_id ) ) {
+								$tags = array( (int) $default_term_id );
+							}
+						}
+
+						if ( ! empty( $tags ) ) {
+							wp_set_post_terms( $post, $tags, $taxonomy );
+						}
+					}
+				}
+			}
 
-			if ( ! is_wp_error( $post ) ) {
+			if ( empty( $post_info['ID'] ) ) {
 				$this->after_create_post( get_post( $post ) );
 			}
 		}

src/Objects/Store.php

@@ -236,7 +236,11 @@ public static function handle_field_smart_tag( $args, $field, $config = array()
 
 		// Convert bools to yes/no.
 		if ( is_bool( $raw_value ) ) {
-			$raw_value = $raw_value ? 'yes' : 'no';
+			if ( ! $raw_value ) {
+				$raw_value = isset( $field['options'] ) && isset( $field['options']['no'] ) ? 'no' : '';
+			} else {
+				$raw_value = 'yes';
+			}
 		}
 
 		// Convert \DateTime to string.