Cisco ticket required then, seems no issues on the configuration side. We had that kind of issue 2 years back where configuration changes after the upgrade, seems like bug that time .. But recommending Cisco ticket
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here you can troubleshoot https://documentation.meraki.com/MX/Content_Filtering_and_Threat_Protection/Content_Filtering/Content_Filtering_Troubleshooting#:~:text=Check%20to%20make%20sure%20that,category%20than%20it%20should%20be.
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