From 624968f28d5f18c4e32c9699ba84159225a57c9c Mon Sep 17 00:00:00 2001
From: David Aguilera <david.aguilera@neliosoftware.com>
Date: Tue, 27 Dec 2022 12:12:15 +0100
Subject: [PATCH 1/2] =?UTF-8?q?Add=20=E2=80=9Ccore/unknown=E2=80=9D=20form?=
 =?UTF-8?q?at=20in=20test=20to=20properly=20flag=20bug.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 packages/rich-text/src/test/register-format-type.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/packages/rich-text/src/test/register-format-type.js b/packages/rich-text/src/test/register-format-type.js
index 0d044d28facf..0f5c16eabf23 100644
--- a/packages/rich-text/src/test/register-format-type.js
+++ b/packages/rich-text/src/test/register-format-type.js
@@ -1,7 +1,7 @@
 /**
  * WordPress dependencies
  */
-import { select } from '@wordpress/data';
+import { dispatch, select } from '@wordpress/data';
 
 /**
  * Internal dependencies
@@ -11,10 +11,21 @@ import { unregisterFormatType } from '../unregister-format-type';
 import { getFormatType } from '../get-format-type';
 import { store as richTextStore } from '../store';
 
+const UNKNOWN_FORMAT = {
+	name: 'core/unknown',
+	title: 'Clear Unknown Formatting',
+	tagName: '*',
+	className: null,
+	edit: () => null,
+};
+
 describe( 'registerFormatType', () => {
 	beforeAll( () => {
 		// Initialize the rich-text store.
 		require( '../store' );
+
+		// Register "core/unknown" format
+		dispatch( richTextStore ).addFormatTypes( UNKNOWN_FORMAT );
 	} );
 
 	afterEach( () => {

From c56d97434efed70ac4792b8dd90c3b46abac7e87 Mon Sep 17 00:00:00 2001
From: David Aguilera <david.aguilera@neliosoftware.com>
Date: Tue, 27 Dec 2022 12:18:48 +0100
Subject: [PATCH 2/2] =?UTF-8?q?Allow=20registration=20of=20a=20bare=20tag?=
 =?UTF-8?q?=20name=20format=20when=20said=20tag=20is=20handled=20by=20?=
 =?UTF-8?q?=E2=80=9Ccore/unknown=E2=80=9D.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 packages/rich-text/src/register-format-type.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/rich-text/src/register-format-type.js b/packages/rich-text/src/register-format-type.js
index b271091cbe6a..8ea19a97f595 100644
--- a/packages/rich-text/src/register-format-type.js
+++ b/packages/rich-text/src/register-format-type.js
@@ -82,7 +82,10 @@ export function registerFormatType( name, settings ) {
 			richTextStore
 		).getFormatTypeForBareElement( settings.tagName );
 
-		if ( formatTypeForBareElement ) {
+		if (
+			formatTypeForBareElement &&
+			formatTypeForBareElement.name !== 'core/unknown'
+		) {
 			window.console.error(
 				`Format "${ formatTypeForBareElement.name }" is already registered to handle bare tag name "${ settings.tagName }".`
 			);