In WordPress 6.6, editor-related slots and APIs have been integrated into the editor package.
As a result, if you run this plugin on WordPress 6.6, you will see messages like the following in the browser console.
wp.editPost.PluginSidebar is deprecated since version 6.6. Please use wp.editor.PluginSidebar instead.
wp.editPost.PluginSidebarMoreMenuItem is deprecated since version 6.6. Please use wp.editor.PluginSidebarMoreMenuItem instead.
We will need to deal with these error messages when this plugin supports WordPress versions 6.6 and above.
In WordPress 6.6, editor-related slots and APIs have been integrated into the editor package.
As a result, if you run this plugin on WordPress 6.6, you will see messages like the following in the browser console.
We will need to deal with these error messages when this plugin supports WordPress versions 6.6 and above.
Source: Editor: Unified Extensibility APIs in 6.6