Tailscale behind Proxy not working anymore

For a couple of month I could run coder.com behind a Cloudflare domain with SSL and DNS proxy. Coder uses Tailscale under the hood as far as I could see. However, it stopped working from the night of 24th to 25th (CET) and after trying a lot of stuff I could finally pinpoint it to Cloudflare DNS Proxy and after disabling it it finally worked again. Has anything specific changed in that timeframe that could disturb these connections?

Thanks a lot for any help!

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