Missing placeholder display for blocked content

Content can't be kept as this what needs to be blocked.
It must be done somewhat like in cookies_addons_views.
Thought I had seen something like this in the code when I checked @_shy s code. But as mentioned didn't have the time to check the rendered output myself.
@_shy said it would be working fine. If not that needs to be fixed. Everything needs a proper placeholder div which is replaced after cookie consent for the specific category.

Created a PR and attached a patch with the changes for easy testing.

I just tested in Drupal 11.2.3 and can confirm there is a placeholder now on both nodes and blocks, but I also noticed the content of the field isn't blocked now. The placeholder just covers the content of the field.
So this needs more work.

<div id="block-olivero-testblockfortestingfieldblockinginblocks" class="block block-block-content block-block-contentbfd273df-2330-489e-be5d-183a295bc5e6">
  
      <h2 class="block__title">Test Block for testing field blocking in blocks</h2>
    
      <div class="block__content">
      
            <div class="cookies-fallback--fields--wrap cookies-fallback--wrap disabled"><div class="cookies-addons-fields-placeholder text-content clearfix field field--name-body field--type-text-with-summary field--label-hidden field__item cookies-fallback--element" data-cookies-service="fields" data-service-name="Fields" data-field-id="block_content-1-body" data-view-mode="full" id="block_content-1-body-content">Test body of blocked field</div><div class="cookies-fallback cookies-fallback--fields cookies-fallback--fields--overlay"><div class="cookies-fallback--text">This content is blocked because field cookies have not been accepted.</div><button class="cookies-fallback--fields--btn cookies-fallback--btn">Accept field cookies</button><a href="#cookiesjsrAccept" class="cookies-fallback--link">Accept All Cookies</a></div></div>
      
    </div>
  </div>

I reworked the PR. Instead of hiding content with a placeholder, I loop through all field items and clear content inside of each.
This will block content and keep the correct structure to render the placeholder correctly.

Please, take a look.