Hi. Can I add my issue to this - I am experiencing exactly the same issue which I've noticed for perhaps the last week or two. I also happen to be in around the same area when this happens - postcode NE12 8DG. My 5G works fine when I'm else where either in the car or at home etc, but when I'm at work which is the NE12 postcode my 5G says it has a full signal but won't actually load anything through the internet.
I am quite tech savvy and tried a few things, included switching my SIM to an e-SIM as I read that a degrading SIM could cause similar issues and my SIM card is quite old, however I am still experiencing the issues. I have noticed however (also temporary fix for OP who posted yesterday) that when I change in my network settings (iPhone settings > Mobile service > SIM > Voice & Data) to 4G instead of 5G, that connection is fine! It shows 4G in the corner and internet loads great, but as soon as I switch to 5G - despite it showing a full 5G signal, it totally cuts out.
I think there may be something wrong with the 5G network in this area despite your network status checker suggesting otherwise.
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