GoalChecker plugin loading in nav2 Controller plugin

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I'm writing a controller plugin for the nav2 stack. The controller loads fine, and the robot moves as I expect.

However, I am now trying to load a GoalChecker plugin into my Controller plugin, but its failing to find the plugin:

Failed to create controller. Exception: According to the loaded plugin descriptions the class cc_nav::SimpleGoalChecker with base class type nav2_core::GoalChecker does not exist. Declared types are

Note: empty list of declared types.

In my plugin XML the SimpleGoalChecker plugin is listed in the same library as my Controller plugin (which then gets exported in CMakeLists with pluginlib_export_plugin_description_file(nav2_core nav2_plugin.xml))

Does the SimpleGoalChecker plugin need to be defined in a different package as the controller plugin?

Incidentally I get a similar error if I try the dwb_plugins::SimpleGoalChecker plugin. Makes me wonder about the empty declared types list