Meta Box

Ok, forum collapse entities also they are inside backticks... Here a pastebin, where converted entities are shown.

Trying to insert 2 different <InnerBloks /> tags causes the same weird result

I think you should make some filters for default settings of tinyMCE. Like as for me: I'm using in most cases very "tinyfied" tinyMCE editor and for cases like this I'm writing some simple helper functions, like 'mb_tinymce_defaults( $extend = false )', that is returns an array of defaults, merged with $extend array if it set

Hi again!

Guys, I'm very-very (really a lot) upset about so log time to find a solution for this. About a year passed, but you didn't make a fix of this issue. I'm really wondering why, because it feels, like you have very low priority to modify and update mb-blocks extension, despite the fact that, in theory, it should be one of the main extension in your bundle stack. I'm really willing you will change your mind about making mb-blocks the most modern and powerful solution of easy-block-building-api's, because such expectations from the product prompted me to buy lifetime developer bundle. Please do not disappoint me and my fellow developers.

As I need ability to customize tinymce editor a lot, yesterday I decide to dive into this problem, trying to figure out where the problem is. I have spend several hours, and finally made a new field, based on default 'wysiwyg' field with some custom improvements and changes. The result works perfect for me and solving all my problems and tasks about that. I really hope that you will review my solution of the problem and fix it in the plugin itself.
NOTE: The code is bad, not refactored and not tested for whole cases, but it works

Here my solution:
You should enqueue modified wysiwyg.js script to the admin area, like as separate file either an inline code. NOTE: the 'rwmb' script dependency handle is required
Here's the js code: https://pastebin.com/kJkCazm5

Next you should register a new extended rwmb field type, that based on default wysiwyg.php class. Just paste the code below into your functions.php theme file, or include it in some other way:
https://pastebin.com/D5R7y0zq

Now you are able to create a new type of field - 'jackky-tinymce', below is my test example (sorry for some weird russian words :)):

[
    'id'                      => 'text',
    'type'                        => 'jackky-tinymce',
    'name'                        => 'Jackky TinyMCE',
    'settings'                    => [ // NOTE: I replaced the 'options' key with the 'settings' key, that contains 2 child keys: 'tinymce', that contains an array of tinymce settings, and 'quicktags' if you need to modify the the textmode tag buttons
        'tinymce'                 => [
                'media_buttons'           => false,
                'drag_drop_upload'        => false,
                'content_css'         => get_template_directory_uri() . '/assets/css/tinymce.min.css', // you can load your custom css file to style the tinymce content like on frontend
                'toolbar1'                => 'styleselect,bold,italic,bullist,numlist,link,unlink,fullscreen', // set different tinymce settings as usual, like a toolbars buttons
                'toolbar2'                => 'alignleft,aligncenter,alignright,undo,redo',
                'style_formats'               => [ // define any nested settings as arrays, like 'style_formats' example
                    [
                        'title'       => 'Имитация strong',
                        'inline'  => 'span',
                        'classes' => 'strong'
                    ],
                    [
                        'title'       => 'Имитация italic',
                        'inline'  => 'span',
                        'classes' => 'em'
                    ],
                    [
                        'title'       => 'Тонкий',
                        'inline'  => 'span',
                        'classes' => 'b300'
                    ],
                    [
                        'title'       => 'Полу-жирный',
                        'inline'  => 'span',
                        'classes' => 'b500'
                    ],
                    [
                        'title'       => 'Экстра-жирный',
                        'inline'  => 'span',
                        'classes' => 'b900'
                    ],
                    [
                        'title'       => 'Имитация h1',
                        'block'       => 'div',
                        'classes' => 'h1'
                    ],
                    [
                        'title'       => 'Имитация h2',
                        'block'       => 'div',
                        'classes' => 'h2'
                    ],
                    [
                        'title'       => 'Имитация h3',
                        'block'       => 'div',
                        'classes' => 'h3'
                    ],
                ],
        ],
        'quicktags'                   => [
                'buttons'             => 'strong,em,u,link,ul,ol,li'
        ]
    ],
]

The result of all of this stuff

With a 'side' context of metabox:

With a standart context:

Also you should add some css to your admin, if you make this field clonable:

.rwmb-jackky-tinymce-clone
{
    padding-top: 20px;
}

Thats all. Feel free to use my solution.

Thank you! Updating helps!