In Opera 52 (52.0.2871.30, the latest, x64) Search Advisor does not work only for Google. Bing, Yahoo, etc. are OK (Search Advisor displays signs).
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On 29.03.2018 at 1:55 PM, 85683213 said:
Exactly. It was QUIC. Disabling QUIC in Opera / Chrome (and probably in all new Chromium based browsers) solves the problem. However, this is just a workaround for now.