Hi @shetheliving thank you guys for your updates, I have checked linode’s support forums, and they already have found that assigning a dedicated IPv6 /64 range solves the issue
I followed the steps mentioned on these posts and now everything works fine again!
https://www.linode.com/community/questions/22243/google-and-linode-server-issues
https://www.linode.com/community/questions/16929/enable-ipv6-addresses-from-pool-permanently
Thanks again for your support! .. I wish you a merry Christmas and happy new year!
Thanks @adamdunnage for the updates .. I already submitted the form and will wait for any further updates