It turned out that this is really a changed behavior in the latest version of the Android SDK, where it lists AVD with the tag information prefix. So instead of armeabi-v7a it returns default/armeabi-v7a , as a result of which QtCreator complains that ABI is not supported.
Here is the QtCreator error report: https://bugreports.qt.io/browse/QTCREATORBUG-11658
You can either wait for the new QtCreator to be released after the patch comes in (it will be reviewed at the moment), or you can try downgrading your Android SDK Tools from version 22.6 to what only ABI: armeabi-v7a reports ABI: armeabi-v7a Tag/ABI: default/armeabi-v7a when running android list avd
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