wp_insert_post_data filter not working correctly after upgrade to WordPress 5

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I have the following code in a project.

function vb_post_modified_date_update($data, $postarr) {  
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )   
      return;  

    if (!empty($postarr['vb_modified_date_switch'])) {  
        $data['post_modified'] = $postarr['post_modified'];  
        $data['post_modified_gmt'] = $postarr['post_modified_gmt'];  
    }  

    return $data;  
}  

add_filter( 'wp_insert_post_data', 'vb_post_modified_date_update', '99', 2 );

What this used to do (it worked before upgrading to WordPress 5), is to keep the old value on post_modified and post_modified_gmt fields when saving the post and a checkbox (vb_modified_date_switch) is checked in the post editor.

According documentation of wp_insert_post_data, $data should have the post data and $postarr should have the unmodified post data. However, debuging, I found that both variables have the same post data (modified data), so now I cant get the original post_modified and post_modified_gmt.

Is there any other way I can change the post data before is saved?

Thanks

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