My adminbot protects "highly used item pages" in Wikidata per policy, based on input from https://analytics.wikimedia.org/published/datasets/wmde-analytics-engineering/wdcm/etl/wdcm_topItems.csv. During the past update of that report (2021-06-07, 18:55), usage numbers have shrunk considerably so that the number of items with usage numbers greater than 500 have decreased from ~29867 to ~18896 within a week (-37%). Safety measures in my bot code prevented the bot from removing ~11.000 existing page protections for now.
Is this some sort of a bug that led to an incomplete report, or has something been changed in the way how "item usage" is being determined?