Pi Hole blocking Google Search from working

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That reply implies that you tried to define a custom CNAME for a public domain, and your debug log confirms you've added some such CNAME records.

Pi-hole's Local CNAME Records prominently disclaims

The target of a CNAME must be a domain that the Pi-hole already has in its cache or is authoritative for. This is a universal limitation of CNAME records.

Adding the respective A and AAAA record definitions could make Pi-hole authoritative for e.g. forcesafesearch.google.com.

If you consider this, you should be aware that when acquiring the IP addresses to add, the IPs you would receive for resolving a given domain may differ from those that someone requesting it from another geographical location may see.
Also, this approach may break as soon as public DNS resolution of such a target domain would change to a different IP.

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