Qt Creator will happily try to deploy a package even if the target device does not support the ABI set in the package. For example, the default ABI is set arm64_v8a but deploying to an armeabi-v7a will not "gray-out" the option or give a reasonable warning, unless you parse through the build logs.

Changing the ABI is also not very visible and you'll need to dig around a bit to find it in the qmake tab in the build section. This should probably be made more visible and easy to find.