Bindings no longer work.

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Describe the bug
Binding a task to Before or After Build no longer works.

To Reproduce
Steps to reproduce the behavior:

1. Create a task.
2. Right-click the task, select Bindings > Before Build. The task will now appear in the Binding list. However, the binding does NOT appear in the commands.json file.
3. In Task Runner Explorer, click the Refresh button. The Task now disappears from the Bindings list.
4. ALSO... When manually entering the binding in the commands.json file, such as: "-vs-binding": { "BeforeBuild": [ "MyTask" ] }, the task does NOT get executed before a build, or at any time during a build.

Expected behavior
I expect a task that it bound to remain in the list, be placed in the commands.json file, and to execute during the appropriate build step.

A Workaround
As a workaround I've added my task to the build process in the .csprog file. This does execute the task during build.

Example:

<Target Name="RunMyTask" BeforeTargets="Build">
	<Exec
	  Condition="Exists('$(MSBuildProjectDirectory)\package.json')"
	  WorkingDirectory="$(MSBuildProjectDirectory)"
	  Command="cmd /c npm run MyTask" />
</Target>