Looks similar to this thread 4 days ago (also Hetzner): My server ip blocked (unblock IP please)
The same hops leading upto the dropped trace probes: core9.fra.hetzner.com followed by 162.158.84.254 (Cloudflare).
Maybe you will be able to get Hetzner’s attention if you point out that two completely different customers on two different subnets are suffering from similar issues talking to Cloudflare’s network … good luck.