Error 521 invoking a worker

Hello,

Today between 6:30 and 7:30 UTC, I received ~750 HTTP 521 errors trying to invoke my worker, which account for ~8% of error rate. I did not find anything on https://www.cloudflarestatus.com/, and I'm wondering if I got rate limited or if I can do something to avoid this problem in the future. I'm on a paid plan.

I'm open to any ideas to investigate this, thank you 🙏
Screenshot_from_2024-05-31_12-12-02.png
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