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The relevant documentation from Google tells you how to do it:
To force SafeSearch for your network, you’ll need to update your DNS configuration. Set the DNS entry for www.google.com (and any other ...
I have seen this too, but it causes no issues with any apps for me. I suspect it is something tied to DNSSEC. I noticed this once I upgraded bind9 to a version that required DNSSEC. I suspect there ...