vscode-cmake-tools: cmake.getLaunchTargetFilename is broken

Bug

If I use ${command:getLaunchTargetFilename} in my task.json I get the following error:

[main] =======================================================
[main] No executable target was found to launch. Please check:
[main]  - Have you called add_executable() in your CMake project?
[main]  - Have you executed a successful CMake configure?
[main] No program will be executed

More Detail

This task.json

{
	// See https://go.microsoft.com/fwlink/?LinkId=733558
	// for the documentation about the tasks.json format
	"version": "2.0.0",
	"tasks": [
		{
			"label": "echo",
			"type": "shell",
			"command": "echo 'buildTargetName: ${command:cmake.buildTargetName}\nbuildType: ${command:cmake.buildType}\ntasksBuildCommand: ${command:cmake.tasksBuildCommand}\nbuildDirectory: ${command:cmake.buildDirectory}\n'"
		}
	]
}

has the following output

buildTargetName: model_test
buildType: Debug
tasksBuildCommand: /usr/bin/cmake --build /home/fbenning/code/grazer/Debug --config Debug --target model_test -- -j 10
buildDirectory: /home/fbenning/code/grazer/Debug

pressing the build button works without error, and executing ./Debug/.../model_test manually works as well. (i.e. the file exists!)

additionally the CMakeLists.txt includes add_executable(model_test ModelTest.cpp).

(Possibly) Related Issues

• https://github.com/microsoft/vscode-cmake-tools/issues/461
• https://github.com/microsoft/vscode-cmake-tools/issues/1412 (Debug Button also does not work [main] Failed to prepare executable target with name 'undefined')

Platform and Versions

• Operating System: Ubuntu
• CMake Version: 3.16.3
• VSCode Version:1.53.2
• CMake Tools Extension Version:1.6.0
• Compiler/Toolchain: GCC 9.3.0