I believe this is related to the use of "dns_v4_fallback off".
That option prevents Squid performing a DNS A lookup if there is any
kind of positive response from an AAAA lookup.
In the case of www.google.com there is always a positive CNAME result.
AAAA lookup produces a positive CNAME-only response with no usable IP
addresses unless you have signed up to the google IPv6 DNS service.
You can verify this on the cache manager "ipcache" report:
squidclient mgr:ipcache
I think you will see a non-zero count for "IPcache CNAME-Only Response:"
AYJ
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