AppStoreConnect Upload Error - Non-public API usage

[reuk]

This issue was fixed recently on master and develop. Please update JUCE to the latest version and try submitting your app again.

Apps built using the latest JUCE (6.1.5) get rejected from app store!

The fix is now on develop. It seemed to resolve the issue for me - once someone has confirmed that the fix also works for them, then I’ll cherry-pick the fix onto master too.