I have the same problem. But "new topic" is working after reloading the page.
Same thing with the correct theme display of forum topics.

Update. After clean cache all works fine, sorry

Hi, i have same problem @JonDoe12
Routing works fine but Nodebb doesn't see my tpl files.
I tried to place tpl files into "/NodeBB/node_modules/nodebb-plugin-custom-pages/templates" and "/NodeBB/public/templates" but nothing happens.
Reboot nodebb does n't helps