@@ -19,6 +19,12 @@ function render_block_core_icon( $attributes ) {
 		return;
 	}
 
+	// Non-public icons are not available in the editor, so do not render them either.
+	$registered_icon = WP_Icons_Registry::get_instance()->get_registered_icon( $attributes['icon'] );
+	if ( false === ( $registered_icon['public'] ?? true ) ) {
+		return;
+	}
+
 	// Text color and background color.
 	$color_styles = array();
 
 
@@ -31,7 +31,7 @@ public function set_up() {
 		if ( ! WP_Icon_Collections_Registry::get_instance()->is_registered( 'core' ) ) {
 			gutenberg_register_default_icon_collections();
 		}
-		if ( empty( WP_Icons_Registry::get_instance()->get_registered_icons() ) ) {
+		if ( empty( WP_Icons_Registry_Gutenberg::get_instance()->get_registered_icons() ) ) {
 			gutenberg_register_default_icons();
 		}
 	}
@@ -42,6 +42,11 @@ public function tear_down() {
 		parent::tear_down();
 	}
 
+	public function test_does_not_render_non_public_icon() {
+		$this->assertNotEmpty( wp_get_icon( 'core/wordpress' ) );
+		$this->assertEmpty( gutenberg_render_block_core_icon( array( 'icon' => 'core/wordpress' ) ) );
+	}
+
 	public function test_preserves_intrinsic_svg_style_when_applying_block_styles() {
 		$output = gutenberg_render_block_core_icon(
 			array(
Original file line number	Diff line number	Diff line change
`@@ -31,7 +31,7 @@ public function set_up() {`
`31`	`31`	`if ( ! WP_Icon_Collections_Registry::get_instance()->is_registered( 'core' ) ) {`
`32`	`32`	`gutenberg_register_default_icon_collections();`
`33`	`33`	`}`
`34`		`- if ( empty( WP_Icons_Registry::get_instance()->get_registered_icons() ) ) {`
	`34`	`+ if ( empty( WP_Icons_Registry_Gutenberg::get_instance()->get_registered_icons() ) ) {`
`35`	`35`	`gutenberg_register_default_icons();`
`36`	`36`	`}`
`37`	`37`	`}`
`@@ -42,6 +42,11 @@ public function tear_down() {`
`42`	`42`	`parent::tear_down();`
`43`	`43`	`}`
`44`	`44`
	`45`	`+ public function test_does_not_render_non_public_icon() {`
	`46`	`+ $this->assertNotEmpty( wp_get_icon( 'core/wordpress' ) );`
	`47`	`+ $this->assertEmpty( gutenberg_render_block_core_icon( array( 'icon' => 'core/wordpress' ) ) );`
	`48`	`+ }`
	`49`	`+`
`45`	`50`	`public function test_preserves_intrinsic_svg_style_when_applying_block_styles() {`
`46`	`51`	`$output = gutenberg_render_block_core_icon(`
`47`	`52`	`array(`