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A sitemap dropping from 100k URLs to 33 usually means something broke sitewide, not just a normal indexing fluctuation. The soft 404 and canonical issues are bigger red flags here. I’d first check for recent changes to canonicals, noindex tags, robots.txt, templates, or sitemap generation around May 5–6. Then test a few affected URLs in live inspection to see how Google is rendering them. I’ve seen big marketplace sites drop fast after faceted nav or internal linking changes too. Did anything major change on the technical side recently?
