HTTP/3 Cloudfare

We're having issues with network calls on iOS with URLSessionDataTask waiting after~325 calls and all future calls timing out at 60s. We have cloudflare on our backend, are there any known issues with QUIC/HTTP/3 implementation on iOS with cloudflare?

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I'm also experiencing URLSessionDataTask timeouts when using QUIC. In my case, they start happening at around 85 parallel calls. I'm not using Cloudflare but tested it with two different operating systems on the server side (latest Debian and FreeBSD) and two different server softwares (latest Nginx and HAProxy). The iOS version is currently 16.6, and it was also happening on the previous iOS 16.x releases. When switching to HTTP/2 while keeping all other parts the same - it works rock solid.

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