Assigning keybinding to workspace level task does not work

• VSCode Version: 1.44.2
• OS Version: Debian 10

Steps to Reproduce:

1. Add a task to the workspace settings such as:
   "tasks": [
   {
   "label": "foo",
   "type": "shell",
   "command": "echo foo",
   }
   ]

2. Try adding a keybinding for that task:
   {
   "key": "alt+shift+a",
   "command": "workbench.action.tasks.runTask",
   "args": "foo"
   }

3. Note that the keybinding does not work.

If you move the task to tasks.json in a folder, it works.

Does this issue occur when all extensions are disabled?: Yes