Extension of core/code: deprecated doesn’t work

Hey there,

At first I just wanted to extend one of WordPress Gutenberg blocks by learning purposes. I chose the ‘core/code’ block. I added the h4 tag for a title below the default content, this part worked fine. Then I decided to change the h4 tag to h2 tag. As I understand now I need to add deprecated array to settings object. I did this but I am getting this error:
Block validation: Expected tag name h2, instead saw h4.

const { InspectorAdvancedControls }	= wp.editor;
const { createHigherOrderComponent } = wp.compose;
const { Fragment } = wp.element;
import { RichText} from "@wordpress/editor";
import deprecated from "./deprecated";

const enableExtendOnBlocks = [
    'core/code',
];

function addAttributes( settings, name ) {

    if ( ! enableExtendOnBlocks.includes( name ) ) {
        return settings;
    }

    if( typeof settings.attributes !== 'undefined' ){

        settings.attributes = {
            ...settings.attributes,
            vista:{
                type: 'string',
                default: 'vista',
                source: 'html',
                selector: 'h2',
            }
        };

        settings.title = 'My Code';

        settings.supports = {
            html: false,
        };

        settings.deprecated = deprecated;

    }

    return settings;
}

wp.hooks.addFilter(
    'blocks.registerBlockType',
    'extend-block-example/custom-attributes',
    addAttributes
);

const withInspectorControls =  createHigherOrderComponent( ( BlockEdit ) => {

    return ( props ) => {

        if ( ! enableExtendOnBlocks.includes( props.name ) ) {
            return <BlockEdit { ...props } />;
        }

        const onChangeVista = (vista) => {
            props.setAttributes({
                vista: vista
            });
        };

        return (
            <Fragment>
                <BlockEdit { ...props } />
                <RichText
                    tagName="h2"
                    formattingControls={[]}
                    value={props.attributes.vista}
                    onChange={(vista) => onChangeVista(vista)}
                />
            </Fragment>
        );
    };
}, "withInspectorControl" );

wp.hooks.addFilter( 'editor.BlockEdit', 'my-plugin/with-inspector-controls', withInspectorControls );

function codeSaveElement( element, blockType, attributes ) {
    if ( blockType.name !== 'core/code' ) {
        return element;
    }

    return (
        <>
            <pre  className={attributes.className}>
                <code>{ escape( attributes.content ) }</code>
            </pre>
            {/*{element}*/}
            <RichText.Content
                tagName="h2"
                value={attributes.vista}
            />
        </>
    );
}

wp.hooks.addFilter(
    'blocks.getSaveElement',
    'extend-block-example/custom-save',
    codeSaveElement
);

and the depricated array:

import {RichText} from "@wordpress/editor";

const oldAtt = {
    vista: {
        type: 'string',
        source: 'html',
        selector: 'h4',
        default: 'vista',
    },
    content: {
        type: "string",
        source: "text",
        selector: "code",
    },
    className: {
        type: "string",
    }
};

const oldAtt2 = {
    content: {
        type: "string",
        source: "text",
        selector: "code",
    },
    className: {
        type: "string",
    }
};

const deprecated = [
    {
        attributes: oldAtt2,
        save: function (oldAtt2) {
            return (
                <>
                    <pre  className={oldAtt2.className}>
                        <code>{ escape( oldAtt2.content ) }</code>
                    </pre>
                </>
            );
        },
    },
    {
        attributes: oldAtt,
        save: function (oldAtt) {
            return (
                <>
                    <pre  className={oldAtt.className}>
                        <code>{ escape( oldAtt.content ) }</code>
                    </pre>
                    <RichText.Content
                        tagName="h4"
                        value={oldAtt.vista}
                    />
                </>
            );
        },
    },
];

export default deprecated;

What I am doing wrong?