Haven't had any connectivity issues to begin with, so I'm probably not the most relevant source of information, but also no (new) connectivity issues after this update either.
Wanted to mention that Garmin Connect 5.21.2 (iPhone 17, iOS 26) resolved all issues for me and synching is even better and more consistent than before this debacle began. It looks like Garmin fixed older issues or optimized the code even more.
