HTTPS (DoH) not working in macOS Safari

So I have the DNS set in the system settings. However when I go to 1.1.1.1/help, HTTPS (DoH) is set to No. Here’s the log: https://1.1.1.1/help#eyJpc0NmIjoiWWVzIiwiaXNEb3QiOiJObyIsImlzRG9oIjoiTm8iLCJyZXNvbHZlcklwLTEuMS4xLjEiOiJZZXMiLCJyZXNvbHZlcklwLTEuMC4wLjEiOiJZZXMiLCJyZXNvbHZlcklwLTI2MDY6NDcwMDo0NzAwOjoxMTExIjoiWWVzIiwicmVzb2x2ZXJJcC0yNjA2OjQ3MDA6NDcwMDo6MTAwMSI6IlllcyIsImRhdGFjZW50ZXJMb2NhdGlvbiI6Ik9SRCIsImlzV2FycCI6Ik5vIiwiaXNwTmFtZSI6IkNsb3VkZmxhcmUiLCJpc3BBc24iOiIxMzMzNSJ9.

Which is not the case if I open 1.1.1.1/help in any Arc (Chromium) or Firefox browsers. Regardless of default or incognito profiles. These also have DNS provider set to Cloudflare in Settings.

It was working fine, but I started questioning my DNS setup when search in supabase.com/docs feature stopped working for me. Getting an ERR_SSL_PROTOCOL_ERROR in the console. But it works in Safari—the only browser that isn’t picking up Cloudflare DNS.

Am I missing a step in macOS setup?

Are you by any chance using iCloud Private Relay?

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