I cannot replicate this issue locally. I attached an empty TypeScript project which I created so that you can test it on your side.
If the issue only replicates in the AppBuilder
simulator, I would recommend that you close all device simulator instances running on your machine and remove the %localappdata%\Telerik\BlackDragon\Cache
If that doesn't help, can you please send over the AppBuilder
log files - they are available under the %localappdata%\Telerik\BlackDragon\Logs
Also, do let me know if the attached project runs as expected on your side and please check if its (and your projects') content is properly displayed on a device so we can narrow down the issue.