Qt Android 6.6.1: Qt6Android.jar: D8: java.lang.NullPointerException

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When attempting to build any project, Widgets or Quick, for Android, including example projects, the following build errors occur.

ERROR:/hdd/code/build-AndroidWidgets-Android_Qt_6_6_1_aarch64_Clang_arm64_v8a-Debug/android-build/libs/Qt6AndroidNetworkInformationBackend.jar: D8: java.lang.NullPointerException
ERROR:/hdd/code/build-AndroidWidgets-Android_Qt_6_6_1_aarch64_Clang_arm64_v8a-Debug/android-build/libs/Qt6Android.jar: D8: java.lang.NullPointerException

Running SDK 12, NDK 25, Java 17 (11 doesn't work), Android 14.

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As it turns out, the AUR packages for the Android aarch64 Qt 6 library are broken. Using the online installer fixes this.