utf-8 and string resources

i have a problem with german umlauts (öäü) in string resources:

whenever i get the app from the ciq store (iq file) i only get "?" instead of umlauts while it works fine when i sideload the app or test in the simulator.

this happened before (see https://forums.garmin.com/developer/connect-iq/i/bug-reports/connect-mobile-and-utf-8-for-app-settings) and seemed to be fixed with SDK 3.2.3 but now using SDK 4.1.7 it re- appeared...