The attached sample project demonstrates that with app-thinning enabled, you cannot include a suffix in the image path. This works fine with app-thinning disabled.
1. Build the project with app-thinning enabled and confirm you see the placeholder image
2. Open tiapp.xml and change use-app-thinning to false
3. Build the project again and confirm you see the image.
The code where we hash the image path should strip out any suffixes (including ~iphone etc).