Can no longer use %{Device:HostAddress} in Run Settings deploy Custom Process Step Arguments

I've just upgraded Qt Creator from version 12.0.2 to 15.0.1 and have hit a problem when deploying a built C++ application to a device. I have a kit defined part of which is a Remote Linux Device that the built binaries are to be deployed to. In the Deployment section of the Run Settings in the Project Explorer  I have a Custom Process Step that calls a bash script which passes the host address of the current device in using %{Device:HostAddress}. This works well on 12.x but in 15.0.1 the entire Device section is missing from the Variable dialog (the one invoked using the A->B icon in the Arguments entry box.

I had a look through the Qt Creator sources and I can see that a change (commit 035d581807d6d66160fa268b9ad423773a05bf35) was made to move the code where these variables are added (from plugins/projectexplorer/kitaspects.cpp to plugins/projectexplorer/devicesupport/devicekitaspects.cpp) but I cannot see anything in the changelogs to describe the nature of the change. What am I missing? Have these variables been moved or removed?