Make a clean build[^1] and run QtCreator from %{sourceDir}\external\qtcreator\dist-Windows\bin\qtcreator.exe and args -pluginpath %{buildDir}\lib\qtcreator\plugins. This should load the plugin.
Check, that it still works (in our case saving is concerned).
[^1]: This is to prevent Qt Creator from loading an old version of the plugin.
This changed API a little bit.
Test Plan
%{sourceDir}\external\qtcreator\dist-Windows\bin\qtcreator.exe
and args-pluginpath %{buildDir}\lib\qtcreator\plugins
. This should load the plugin.[^1]: This is to prevent Qt Creator from loading an old version of the plugin.