Umlauts broken in Sonoma 14.4?

When running my app from Xcode Umlauts are all of a sudden broken in several places. The app has been out in the public w/o similar issues for years.

For example, this is the result when entering a filename in my NSDocument-based app:

So far I could only observe the bug when launching under Sonoma from Xcode but I'm worried this might be a general issue for users of the app running the release build.

Any ideas about what happened in macOS 14.4..?

Cheers,
Jay

Replies

..same happening for labels (plain NSTextFields) in some views: