the same issue here ,every time is same,I upgraded Macos big sur 11.4 ,safari 14.1.1 and iOS 14.6 JavaScriptCore`invocation function for block in Inspector::RemoteConnectionToTarget::dispatchAsyncOnTarget(***::Function<void ()>&&):

Same issue here. iOS 14.6, macOs 11.4 big , safari 14.1.1 , safari Technology Preview 125-127