No that wasn't it, I had the developer look into this over the weekend, it was the Bialty Plugin used for the Disability Access features which was causing this problem. I am still having problems now with GSC indexing so he is working on that.
As I told you in the other thread, I dumped that BIALTY plugin as well for other reasons, including (1) it had a significant negative impact on page load speed, and (2) really it was adding something that can easily be managed manually - basically when you upload images, make sure you provide them with good explanatory alt tags and where appropriate captions.
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