mattsaul

Wherever you have code you don?t want the visual editor to touch use the [ignore_code] shortcode. 
This version also supports the [insert_php] and <?php tags, though for the PHP tag you will have to 
start the first line with <?php // > With latter two codes you will have to separately install 
plugins to get the dynamic PHP insertion functionality.

Ignore Code

I am using WordPress 6.1. My shortcodes are not ignored within the block editor with this plugin.

Nice idea but does not work

Causes the visual editor to ignore code within the ignore_code shortcode.  Great at keeping advanced HTML, JavaScript, or PHP code intact.

PiotrPress

Clearcode

The CC-Syntax-Highlight plugin supports syntax highlighting of Posts, Pages, and any public Custom Post Types. 
It uses <a href="https://highlightjs.org/" rel="nofollow ugc">highlight.js</a> or <a href="https://github.com/google/code-prettify" rel="nofollow ugc">google-code-prettify</a> libraries. 
Additionally it can use the <a href="https://clipboardjs.com/" rel="nofollow ugc">clipboard.js</a> library to add a button that copies text to the clipboard and <a href="https://github.com/wcoder/highlightjs-line-numbers.js/" rel="nofollow ugc">highlightjs-line-numbers.js</a> plugin to add line numbers. 
It is delivered with support for shortcode (default [code] – you can change it on the settings page) which automatically converts all special characters to HTML entities. 
This plugin is compatible with Multisite WordPress installations.
<h4>How does it work?</h4>
<ol>
<li>Go to the ‘Settings > Syntax Highlight’ page, select your preferred options and save them.</li>
<li>Simply add the source code to your post (or other selected public Custom Post Type) wrapped with: 
<pre><code>Your source code</code></pre> 
or if you would like to automatically convert all special characters to HTML entities, use shortcode wrapper instead (default [code] – you can change it on the settings page): 
<pre>[code]Your source code[/code]</pre></li>
</ol>
Plugin’s js scripts and css styles files only load if the source code occurs on displaying page.

CC-Syntax-Highlight

This plugin allows you very simply syntax highlight source code in your content using highlight.js or google-code-prettify libraries.

Ignore Code vs CC-Syntax-Highlight