このプラグインは 2.6 ベータ 2 で動作を停止しているようです。@fzngagan 有効化すると Discourse でトピックを読み込めません。以下のエラーをご覧ください。
メッセージ（204 件報告）
ArgumentError（引数の数が不正です（1 が与えられましたが、0 が期待されています））
lib/topic_view.rb:59:in `initialize'
app/controllers/topics_controller.rb:81:in `new'
app/controllers/topics_controller.rb:81:in `show'
app/controllers/application_controller.rb:340:in `block in with_resolved_locale'
app/controllers/application_controller.rb:340:in `with_resolved_locale'
lib/middleware/omniauth_bypass_middleware.rb:68:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:334:in `call'
config/initializers/100-quiet_logger.rb:23:in `call'
config/initializers/100-silence_logger.rb:31:in `call'
lib/middleware/enforce_hostname.rb:22:in `call'
lib/middleware/request_tracker.rb:176:in `call'
バックトレース
plugins/discourse-category-lockdown/plugin.rb:41:in `check_and_raise_exceptions'
lib/topic_view.rb:59:in `initialize'
app/controllers/topics_controller.rb:81:in `new'
app/controllers/topics_controller.rb:81:in `show'
actionpack (6.0.3.2) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack (6.0.3.2) lib/abstract_controller/base.rb:195:in `process_action'
actionpack (6.0.3.2) lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack (6.0.3.2) lib/abstract_controller/callbacks.rb:42:in `block in process_action'
activesupport (6.0.3.2) lib/active_support/callbacks.rb:112:in `block in run_callbacks'
app/controllers/application_controller.rb:340:in `block in with_resolved_locale'
Env