@azaozz I have 5.9.0 installed and I still see this deprecation warning when I have it enabled:
<span style="font-family: -webkit-standard; font-size: medium; white-space: normal;">Deprecated: Creation of dynamic property Advanced_Editor_Tools::$toolbar_classic_block is deprecated in /app/wp-content/plugins/tinymce-advanced/tinymce-advanced.php on line 306</span>
In the code at https://plugins.trac.www.ads-software.com/browser/tinymce-advanced/trunk/tinymce-advanced.php#L306 I see that toolbar_classic_block is a property that has not been defined earlier in the class at https://plugins.trac.www.ads-software.com/browser/tinymce-advanced/trunk/tinymce-advanced.php#L43 so it is a dynamic property. Would adding the following fix the warning?
private $toolbar_classic_block = array();
