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Updated to the latest version (2.2.32) and the background images that I had on my accordion buttons disappeared. They still show up in the admin, but not on the front end display. The background url() in the CSS is blank.
Checked the code and found that you’ve introduced the esc_url_raw() function to escape the background image URLs. Which is fine, but on line 265 of templates/accordion/accordion-hook.php, you use esc_url_raw() around $header_bg_img which contains url() in it, so of course it fails and removes the whole URL. The esc_url_raw() needs to be moved to wrap the $background_img on line 260 instead so that it only escapes the actual URL.