A bizarre problem: ERR_NAME_NOT_RESOLVED

Problem didn’t resolve itself in almost two hours, and no amount of searches and guides helped me, so here I am.

My domain shows “ERR_NAME_NOT_RESOLVED” in the browser.
Here are nslookups:

nslookup chatmanager.pro 1.1.1.1
Server:  one.one.one.one
Address:  1.1.1.1
*** one.one.one.one can't find chatmanager.pro: Non-existent domain

However, if I perform lookup directly on a nameserver my domain is delegated to:

nslookup chatmanager.pro lee.ns.cloudflare.com
Server:  lee.ns.cloudflare.com
Address:  172.64.33.129

Name:    chatmanager.pro
Addresses:  2a06:98c1:3121::3
          2a06:98c1:3120::3
          188.114.96.3
          188.114.97.3

As you can see this is not a problem on my side.
DNSSEC is turned off, and was never turned on.
I do have existing A/AAAA records, everything was working just fine for years.
I have changed literally nothing in my configuration today, and this week, and this year.
The SSL certificate Cloudflare issues is not even close to running out, and should not be related anyway.
Purging DNS records on Cloudflare-dns com did not help.

What is the solution to this problem?

You’ve been pretty thorough, but this might be a snag in your domain registration:

https://icann.org/epp#clientHold

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