In Xcode 14 & iOS 16 purple warnings starting with ‘This method should not be called on the main thread as it may lead to UI unresponsiveness.’

Good in-depth reply from an Apple employee on the forums.

The poor interaction between WKWebView, Security framework, and this Xcode feature is a known issue (r. 94019453). We plan to address it at some point but I don’t have any info to share as to when that’ll happen.