Xcode 16.3 beta Predictive Code Completion not working

With MacOS Sequoia 15.4 Beta (24E5206s) and Xcode 16.3 beta (16E5104o), Predictive Code Completion no longer works. Prior to the update, (as of yesterday) completion worked under Xcode 16.2 and MacOS 15.3 Beta. The models are already loaded. So far, I've found the Predictive Completion to be useful in some situations (eg multiple cases in a switch), variably reliable in others (eg code suggestions in a CoreData stack) and downright wrong & annoying in others (eg referring to functions / modules that don't exist). Regards, Michaela