dkpdf-button shortcode has strange behaviour

  • Hello, I am filtering the content of one page using 

    add_filter('the_content', function($content) {
 //my stuff, ending with

 $content .= '[dkpdf-button]';

}, 10, 1);

    The PDF button is appearing well, but when generating the PDF, the text [dkpdf-button] is showed inside the PDF.

    Is there any workaround, avoiding the use of the shortcode inside the_filter hook?

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