With Litespeed Cache 4.2, a page doesn't refresh after comment submit. The comment does get submitted but the code \LiteSpeed\Purge::purge_url(get_the_permalink($postId)); generates an error when wpdiscuz tries to clear the cache of the page.

The code provided by Litespeed support works fine https://wordpress.org/support/topic/wpdiscuz-submit-comment-issue/#post-14801776