My problem is similar - the comment bubble doesn't appear on pages on my staging site, but it does on posts. It does appear on pages on my live site and my development site though.  The wpDiscuz settings, the theme and plugins are the same.  The only difference seems to be the pages in the staging site are full width - OceanWP and stretched in Elementor. In all cases Pages have comments enabled, Setting>Discussion is set to allow people to comment, etc.