Custom Plugin names appear twice in editor

Calling the function

FTabSpawnerEntry& RegisterNomadTabSpawner( const FName TabId, const FOnSpawnTab& OnSpawnTab );

to display the name of a new plugin causes the name to be displayed twice.

In the attached project, commenting out line 42 from MyTestPlugin.cpp will remove both instances of "My Test Plugin" from Window dropdown menu.

1. Download and build attached project
2. Open the project
3. Navigate to Window dropdown in the Menu bar

Result:
"My Test Plugin" is listed twice in the dropdown list. Clicking either will open the same plugin menu window.

Expected:
My Test Plugin is only listed once in the drowdown menu