There is one other error in the developer console, which seems related to the recent event/chat integration:
backup-codes.js:33 ℹ️ Discourse v3.5.0.beta6-dev — https://github.com/discourse/discourse/commits/89d5cca2af — Ember v5.12.0
backup-codes.js:33 Uncaught Error: Could not find module `discourse/plugins/chat/discourse/components/channel-title` imported from `discourse/plugins/discourse-calendar/discourse/components/discourse-post-event/chat-channel`
at loader.js:247:1
at a (loader.js:258:1)
at s.findDeps (loader.js:168:1)
at a (loader.js:262:1)
at s.findDeps (loader.js:168:1)
at a (loader.js:262:1)
at s.findDeps (loader.js:168:1)
at a (loader.js:262:1)
at s.findDeps (loader.js:168:1)
at a (loader.js:262:1)
at requireModule (loader.js:24:1)
at y (backup-codes.js:33:1)
at b (backup-codes.js:33:1)
at backup-codes.js:33:1
at g.start (backup-codes.js:33:1)
at HTMLDocument.<anonymous> (start-discourse-2f46827b.js:3:52)
at start-discourse-2f46827b.js:6:10
at start-discourse-2f46827b.js:6:27