Websockets stopped working

All attempts to connect to websocket services result in 503 Service Unavailable using full strict mode with a universal certificate, but switching to DNS only and another certificate (let's encrypt for example) fixes the issue but leaves the servers without proxies

The issue appeared yesterday out of nowhere as no one changed the settings and services

Interestingly, using my personal domain with the same settings in the dashboard and in nginx fixes the issue too

Examples (both addresses are routed to the same server and are behind the CF proxy):
wss://wss-test.perch1.me/websockify
  • connects and then returns 400 (expected)
    wss://wss-test.h8r.gg/websockify
    • doesn't connect and returns 503
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