In androiddeployqt/main.cpp, an assumption is made that the last segment of androidPlatform will be the platform version number:

gradleProperties["androidCompileSdkVersion"] = options.androidPlatform.split(u'-').last().toLocal8Bit();

This is not true any more since there are android-33-ext4 and android-33-ext5 platforms. If --android-platform is not explicitly specified and one of these platform versions is installed in the SDK, androiddeployqt will scan the platforms directory, pick android-33-ext5, and use "ext5" as the version instead of "33", which causes gradle to crash.

Qt5AndroidSupport.cmake had an escape hatch for this where the platform version could be explicitly specified by setting ANDROID_SDK_PLATFORM, but this function was removed in Qt6AndroidMacros.cmake, so it is also impossible to work around this using the normal Qt6 CMake macros.