Decreasing number of annotations in google patents research in recent batches

[complexly]

Could someone help me understand why the number of annotations in google patents research are dropping in recent batches?

202208 verison: 59,089,580,018 rows
202212 verison: 60,246,963,593 rows
202304 verison: 63,130,241,301 rows
202307 verison: 48,064,657,811 rows
current verison: 41,000,981,833 rows

Data size seems increasing before 202307 but decreasing greatly afterwards. Is it due to model changes/coverage change, or some other reason? And which vesion of data should I rely on more for some analysis? Is the most recent version most trustable? Thanks!