EventSource/Server-Sent Events (SSE) responses getting buffered by Cloudflare all of a sudden

Hi all, we are CF Enterprise, and about two hours ago, our pages that use EventSource/SSE have stopped working and are buffering indefinitely. When Cloudflare is disabled on a domain, everything works. Any employees, are you aware of a code push that could have broken this today?

I started a ticket and created simple test pages as well. https://www.support.cloudflare.com/s/case/500Nv00000WgYCeIAN/eventsourceserversent-events-sse-responses-getting-buffered-by-cloudflare-all-of-a-sudden-as-of-today-breaking-realtime-streaming
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