The _all_wikimedia database update is showing a massive decrease in contacts that surpasses the amount the Master Suppression List gained. Usually, we think a small drop is fine as long as the difference is not larger than the new MSL contacts, but as you can see from the screenshot below, the main database dropped by over 1 million. This issue is specifically from yesterday (11/24) to today (11/25). Please see attached screenshot for more details.
Please let us know if you have any questions. Setting priority as high for now.