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Well, seems that GSC contradicted this report. I don't think that's the issue.

Just a note that we've discontinued the old Crawl Test tool and have launched an entirely new On-Demand Crawl tool based on our upgraded Site Crawl engine (launched last year). The new tool has an enhanced UI, entirely rebuilt back-end, full export capability, and will save your old crawls for up to 90 days. We've written up a sample case study or logged-in customers can go directly to On-Demand Crawl.