WordPress Update 6.6 New Error Arise

[JoePepe]

The “gutenkit-template-library” plugin has encountered an error and cannot be rendered.

Whenever we are going to create new page then showing this type error.

I am creating new page and hit publish then show this error (The “gutenkit-template-library” plugin has encountered an error and cannot be rendered.)

[swissspidy]

Hi there and welcome to WordPress Trac!

Here we deal with bugs and enhancements to WordPress core itself. This looks to be an issue with the third-party GutenKit plugin, so you would need to ​report this directly to them.

[JoePepe]

Hello Thank you for the answer I omitted the fact that the plugin is not installed in wordpress which makes it even more curious.

[power2009]

So i have too 2 issues - with 6.6 and 6.6.1

1. New / Edit posts: The "gutenkit-template-library" plugin has encountered an error and cannot be rendered.
2. Site Health Status: Autoloaded options are configuration settings for plugins and themes that are automatically loaded with every page load in WordPress. Having too many autoloaded options can slow down your site. Your site has 2027 autoloaded options (size: 935 KB) in the options table, which could cause your site to be slow. You can review the options being autoloaded in your database and remove any options that are no longer needed by your site.

PS> I don't use ElementEditor. In version 6.5 all is good

TypeError: Cannot read properties of null (reading 'appendChild')
    at post-editor-template…98e05c9300a:1:92828
    at ri (react-dom.min.js?ver=18.3.1:2:93198)
    at Ss (react-dom.min.js?ver=18.3.1:2:113320)
    at react-dom.min.js?ver=18.3.1:2:112062
    at ws (react-dom.min.js?ver=18.3.1:2:112127)
    at is (react-dom.min.js?ver=18.3.1:2:105883)
    at Hl (react-dom.min.js?ver=18.3.1:2:46663)
    at react-dom.min.js?ver=18.3.1:2:103288
co      @       react-dom.min.js?ver=18.3.1:2