Continuing the discussion from Discourse Fingerprint - Browser Fingerprinting Plugin:
This is happening because of a route conflict.
Core defines
admin_plugins GET /admin/plugins/:plugin_id(.:format) admin/plugin#show {format: /(json|html|\*\/\*)/}
The plugin defines this
admin_plugins_fingerprint GET /admin/plugins/fingerprint(.:format) discourse_fingerprint/fingerprint_admin#index
Instead of returning the results from the fingerprint_admin#index, we get the results from the admin/plugin#show controller, i.e. the plugin metadata.
there are a few more issues in this plugin like the route format deprecation
and the plugin.rb metadata pointing to the old URL for this plugin # url: https://github.com/udan11/discourse-fingerprint.git