vscode.tasks.taskExecutions not cleaned up when a no-command task is terminated

[cnshenj]

• VSCode Version: 1.38.1
• OS Version: Windows 10 1903

Steps to Reproduce:

1. Prepare the following tasks. parent has no command, only depends on echo.

    "tasks": [
        {
            "label": "echo",
            "type": "shell",
            "command": "echo Hello"
        },
        {
            "label": "parent",
            "dependsOn": ["echo"]
        }
    ]

2. Use vscode.tasks.fetchTasks() to get tasks then execute parent. vscode.tasks.taskExecutions now contains 2 instances, one for echo, one for parent.
3. Once echo is completed (parent should be completed too since there is nothing left to do), check vscode.tasks.taskExecutions.

Expected:
vscode.tasks.taskExecutions should be empty.

Actual:
vscode.tasks.taskExecutions still contains an instance for parent.

Does this issue occur when all extensions are disabled?: Yes/No