videoSourcesData (quality/dub failover list) wasn't routed through stream.proxy, so switching quality/dub hit Anizium's CDN directly and got blocked by CORS. aniziumserver.sbs was also wrongly whitelisted as CORS-safe in isOwn — it isn't, per browser console evidence. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>