diff --git a/packages/e2e-tests/specs/rich-text.test.js b/packages/e2e-tests/specs/rich-text.test.js
index 4ebe263fedc34b..dcb1434abd89be 100644
--- a/packages/e2e-tests/specs/rich-text.test.js
+++ b/packages/e2e-tests/specs/rich-text.test.js
@@ -70,6 +70,22 @@ describe( 'RichText', () => {
 		expect( await getEditedPostContent() ).toMatchSnapshot();
 	} );
 
+	it( 'should not highlight more than one format', async () => {
+		await clickBlockAppender();
+		await pressKeyWithModifier( 'primary', 'b' );
+		await page.keyboard.type( '1' );
+		await pressKeyWithModifier( 'primary', 'b' );
+		await page.keyboard.type( ' 2' );
+		await pressKeyWithModifier( 'shift', 'ArrowLeft' );
+		await pressKeyWithModifier( 'primary', 'b' );
+
+		const count = await page.evaluate( () => document.querySelectorAll(
+			'*[data-rich-text-format-boundary]'
+		).length );
+
+		expect( count ).toBe( 1 );
+	} );
+
 	it( 'should return focus when pressing formatting button', async () => {
 		await clickBlockAppender();
 		await page.keyboard.type( 'Some ' );