I have the following behaviour with the same App downloaded from TestFlight:
- iphone 6 with iOS 10.3.3 => the host icon is correctly fetched
- ipod touch 6 with iOS 11.0.2 => the host icon is not found. A default icon is displayed
I made the test with two different hosts : GarageBand and ToneStack
My guess is the issue is with iOS version.
I’m using juce 5.1.2 with the link fix for getIAAHostIcon.