Apparently Java has "Modified UTF8" because Java does not support 4 character UTF8 chars https://stackoverflow.com/questions/16786739/how-to-use-unicode-in-android-resource

This results in:
If WebAPK has a non-Basic-Multilingual-Plane-character the short_name:
- The WebAPK title is displayed as the short name and the long name concatenated
- The WebAPK crashes in debug mode (but not release mode) when launched