There is no correlation here with #SB50.
As I understand it, the primary issue here was caused by a temporary problem with a batch of Tweets being accidentally labelled as spam and excluded from the index, as I mentioned above. We fixed that issue and corrected that batch so that they were indexed correctly.
I’m not aware of any other search quality issue at the moment, so I’d need more detail of what you’re seeing. Remember that the public search API is not a complete index of all accounts and Tweets, is optimised for recency, and only covers a limited timeframe.