same issue here, although i went quite far to clear up the web view, and delegates and attached config after done with web view, still its kept in memory.
SyncAsync
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
What I see is that SecTrustEvaluateIfNecessary is causing this. Which means a deadlock to my understanding: unless you figure out how to override certificate trust check of WKWebView to do it in background thread separately from loading web view url (needs to be on main thread).