Hello, I’m currently experiencing the same thing, I’m getting a blank screen after form update/ submission.
It was working fine until the latest version of WordPress and an upgrade to PHP 7.4.
Did you ever solve this problem?
My code to generate the form.
acf_form(array( 'id' => 'acf-form-quick', 'post_title' => false, 'post_content' => true, 'field_groups' => array('group_5a3824afd298b','group_5cb4e53b433ea','group_583f59f20ee1','group_5a38276e809f8','group_5a3827b18c5c0','group_57f6b7add6a3d'), 'submit_value' => __('Update Project', 'acf'), 'html_submit_button' => '<input type="submit" class="acf-button uk-button uk-button-primary btn3d uk-margin-large-bottom uk-align-center" value="%s" />', 'return' => '%post_url%' ));
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