Isso me confunde também. Tem razão—os dois sites usam os mesmos servidores, do mesmo jeito, no DNS.
Entretanto o comportamento do servidor Blogger é bem diferente nos dois casos:
$ curl -v https://blogueiraquantica.com/
* Trying 216.239.36.21...
* TCP_NODELAY set
* Connected to blogueiraquantica.com (216.239.36.21) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS Unknown, Certificate Status (22):
* TLSv1.3 (IN), TLS handshake, Unknown (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Client hello (1):
* TLSv1.3 (OUT), TLS Unknown, Certificate Status (22):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server accepted to use h2
* Server certificate:
* subject: CN=blogueiraquantica.com
* start date: Aug 21 06:03:08 2020 GMT
* expire date: Nov 19 06:03:08 2020 GMT
* subjectAltName: host "blogueiraquantica.com" matched cert's "blogueiraquantica.com"
* issuer: C=US; O=Google Trust Services; CN=GTS CA 1D2
* SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* TLSv1.3 (OUT), TLS Unknown, Unknown (23):
* TLSv1.3 (OUT), TLS Unknown, Unknown (23):
* TLSv1.3 (OUT), TLS Unknown, Unknown (23):
* Using Stream ID: 1 (easy handle 0x5594d7931580)
* TLSv1.3 (OUT), TLS Unknown, Unknown (23):
> GET / HTTP/2
> Host: blogueiraquantica.com
> User-Agent: curl/7.58.0
> Accept: */*
>
* TLSv1.3 (IN), TLS Unknown, Unknown (23):
* Connection state changed (MAX_CONCURRENT_STREAMS updated)!
* TLSv1.3 (OUT), TLS Unknown, Unknown (23):
* TLSv1.3 (IN), TLS Unknown, Unknown (23):
* TLSv1.3 (IN), TLS Unknown, Unknown (23):
< HTTP/2 301
< location: https://www.blogueiraquantica.com/
< date: Fri, 18 Sep 2020 19:51:44 GMT
< content-type: text/html; charset=UTF-8
< server: ghs
< content-length: 231
< x-xss-protection: 0
< x-frame-options: SAMEORIGIN
<
* TLSv1.3 (IN), TLS Unknown, Unknown (23):
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="https://www.blogueiraquantica.com/">here</A>.
</BODY></HTML>
* TLSv1.3 (IN), TLS Unknown, Unknown (23):
* Connection #0 to host blogueiraquantica.com left intact
e
$ curl -v https://blogtanamoda.com/
* Trying 216.239.38.21...
* TCP_NODELAY set
* Connected to blogtanamoda.com (216.239.38.21) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to blogtanamoda.com:443
* stopped the pause stream!
* Closing connection 0
curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to blogtanamoda.com:443
Está conectando no mesmo servidor, mas num caso o servidor responde, e no outro, o servidor desliga bem no começo da conversa sem nem mesmo dizer adeus.
Infelizmente acho que só o Blogger saberia o motivo das diferenças no comportamento do servidor aqui. 
