The Asia Maritime Transparency Initiative of Center for Strategic and International Studies provides a report showing the extent of China Coast Guard patrols of five features of the South China Sea, Second Thomas Shoal, Luconia Shoals, Scarborough Shoal, Vanguard Bank, and Thitu Island, in 2022 and comparing that to 2020. (There was no explanation for why no information regarding 2021 was included.)
The report also indicated that China Coast Guard is using automatic identification system (AIS) in a deceptive manner.
Thanks to Paul for bringing this to my attention.
Another look at this report. https://americanmilitarynews.com/2023/02/report-china-coast-guard-more-robust-than-ever/