Problem with editor font sizes in WP 6.1

Hi, this is my code, which used to work correctly in WP 6.0.2

add_theme_support(
			'editor-font-sizes',
			array(
				array(
					'name'      => esc_html__( 'XS', 'mywebsite' ),
					'shortName' => esc_html_x( 'XS', 'Font size', 'mywebsite' ),
					'size'      => 14,
					'slug'      => 'extra-small',
				),
				array(
					'name'      => esc_html__( 'S', 'mywebsite' ),
					'shortName' => esc_html_x( 'S', 'Font size', 'mywebsite' ),
					'size'      => 16,
					'slug'      => 'small',
				),
				array(
					'name'      => esc_html__( 'M', 'mywebsite' ),
					'shortName' => esc_html_x( 'M', 'Font size', 'mywebsite' ),
					'size'      => 18,
					'slug'      => 'normal',
				),
				array(
					'name'      => esc_html__( 'L', 'mywebsite' ),
					'shortName' => esc_html_x( 'L', 'Font size', 'mywebsite' ),
					'size'      => 30,
					'slug'      => 'large',
				),
				array(
					'name'      => esc_html__( 'XL', 'mywebsite' ),
					'shortName' => esc_html_x( 'XL', 'Font size', 'mywebsite' ),
					'size'      => 40,
					'slug'      => 'extra-large',
				),
			)
		);

and here you can see how it looks like now in editor: https://ibb.co/2383bvh

As you can see, there is no px value. Only name of font size, which isn’t the same as on button.

If I choose for example L on button, the has-normal-font-size class is applied. So it works like it used to be, only labels on the buttons are incorrect (and missing px value).

Is it a bug in WP 6.1 or do I have to change something? What exactly? I didn’t find any information about this in field guide.

I don’t have theme.json and don’t want to add it now.