Can’t reproduce this, and it seems it’s settings coming from a plugin (Topic List Previews ?) can you reproduce on any “native” discourse settings ?
I try rebuilding my instance several times but nothing changed. I tried uninstall Topic List Previews same thing.
Can you try safe mode per: How to use Discourse Safe Mode
This may be a theme or a 3rd party plugin
./discourse-doctor in your SSH client and it’ll present you with error logs.