Возможно, это связано? В логах повторяется ошибка:
Исключение в задаче: у экземпляра класса String нет метода `name`
/var/www/discourse/app/models/topic_embed.rb:125:in `map`
/var/www/discourse/app/models/topic_embed.rb:125:in `import`
/var/www/discourse/plugins/discourse-rss-polling/app/jobs/jobs/discourse_rss_polling/poll_feed.rb:52:in `block in poll_feed`
/var/www/discourse/plugins/discourse-rss-polling/app/jobs/jobs/discourse_rss_polling/poll_feed.rb:41:in `each`
/var/www/discourse/plugins/discourse-rss-polling/app/jobs/jobs/discourse_rss_polling/poll_feed.rb:41:in `poll_feed`
/var/www/discourse/plugins/discourse-rss-polling/app/jobs/jobs/discourse_rss_polling/poll_feed.rb:20:in `execute`
/var/www/discourse/app/jobs/base.rb:305:in `block (2 levels) in perform`
rails_multisite-6.0.0/lib/rails_multisite/connection_management/null_instance.rb:49:in `with_connection`
rails_multisite-6.0.0/lib/rails_multisite/connection_management.rb:21:in `with_connection`
/var/www/discourse/app/jobs/base.rb:292:in `block in perform`
/var/www/discourse/app/jobs/base.rb:288:in `each`
/var/www/discourse/app/jobs/base.rb:288:in `perform`
sidekiq-6.5.12/lib/sidekiq/processor.rb:202:in `execute_job`
sidekiq-6.5.12/lib/sidekiq/processor.rb:170:in `block (2 levels) in process`
sidekiq-6.5.12/lib/sidekiq/middleware/chain.rb:177:in `block in invoke`
/var/www/discourse/lib/sidekiq/pausable.rb:132:in `call`
sidekiq-6.5.12/lib/sidekiq/middleware/chain.rb:179:in `block in invoke`
sidekiq-6.5.12/lib/sidekiq/middleware/chain.rb:182:in `invoke`
sidekiq-6.5.12/lib/sidekiq/processor.rb:169:in `block in process`
sidekiq-6.5.12/lib/sidekiq/processor.rb:136:in `block (6 levels) in dispatch`
sidekiq-6.5.12/lib/sidekiq/job_retry.rb:113:in `local`
sidekiq-6.5.12/lib/sidekiq/processor.rb:135:in `block (5 levels) in dispatch`
sidekiq-6.5.12/lib/sidekiq.rb:44:in `block in <module:Sidekiq>`
sidekiq-6.5.12/lib/sidekiq/processor.rb:131:in `block (4 levels) in dispatch`
sidekiq-6.5.12/lib/sidekiq/processor.rb:263:in `stats`
sidekiq-6.5.12/lib/sidekiq/processor.rb:126:in `block (3 levels) in dispatch`
sidekiq-6.5.12/lib/sidekiq/job_logger.rb:13:in `call`
sidekiq-6.5.12/lib/sidekiq/processor.rb:125:in `block (2 levels) in dispatch`
sidekiq-6.5.12/lib/sidekiq/job_retry.rb:80:in `global`
sidekiq-6.5.12/lib/sidekiq/processor.rb:124:in `block in dispatch`
sidekiq-6.5.12/lib/sidekiq/job_logger.rb:39:in `prepare`
sidekiq-6.5.12/lib/sidekiq/processor.rb:123:in `dispatch`
sidekiq-6.5.12/lib/sidekiq/processor.rb:168:in `process`
sidekiq-6.5.12/lib/sidekiq/processor.rb:78:in `process_one`
sidekiq-6.5.12/lib/sidekiq/processor.rb:68:in `run`
sidekiq-6.5.12/lib/sidekiq/component.rb:8:in `watchdog`
sidekiq-6.5.12/lib/sidekiq/component.rb:17:in `block in safe_thread`