Directives Are Not Encoded/Decoded Correctly

[sprankhub]

• Create a static block with the identifier test_block in two store views store A and store B and insert a skin directive. Example:

    <p><img alt="" src="{{skin url="images/img.png"}}" /></p>
  

• Go to the edit page of the static block. You see two text areas / WYSIWYG editors.

• Disable the WYSIWYG editor for the static block of store A.

• Click save.

• Check the content in the database:

    SELECT * FROM `cms_block` WHERE `identifier` = 'test_block';
  

Expected:
The content in the database is stored correctly for store A and store B.

<p><img alt="" src="{{skin url="images/img.png"}}" /></p>

Actual:
The content in the database is stored encoded for store B.

<p><img alt="" src="http://magento.local/index.php/customadmin/cms_wysiwyg/directive/___directive/e3tza2luIHVybD0iaW1hZ2VzL2ltZy5wbmcifX0,/key/2cbf090a2fafbc2b9457a0f93ebcb220/" /></p>

This of course leads to a broken image in the frontend.