Earlier today, Lone Learner asked Why is there no certificate error while visiting google.net although it presents a certificate issued to google.com?
The accepted answer explains that the issue was caused by an SNI Hole.
You've fallen into a "SNI hole". Google will present a different certificate if there is no "Server Name Indication" given in the client's TLS handshake part.
The top search result for "What is an SNI Hole" is the question page for What are the security implications of enabling a SNI-hole on a web server?, which isn't much help for those unfamiliar with the term.
What exactly is an SNI Hole?