I'm unable to ping/or perform curl to any website from an instance which has only ipv6 address assigned whereas I'm able to ping/access internet if I create a windows instance with same settings (Ubuntu or Amazon Linux instances are not working), some of the details of the ec2 Instance are as follows
ip -6 addr:

Route Table for subnet:

Network ACL for subnet:

Ping command response (Stuck with no output): https://i.stack.imgur.com/gYY0j.png
Security Group Outbound Rules https://i.stack.imgur.com/ODGEf.png