remapping keys isn't working

I'm remapping keys in settings.json(vscode) like that:

  "vim.normalModeKeyBindingsNonRecursive": [
    {
      "before":["<S-j>"],
      "commands": [
        ":m-2",
      ]
    },
    {
      "before":["<S-k>"],
      "commands": [
        ":m+",
      ]
    } 
  ]  

So when I try to type Shift-k, I see :m+ in vim command line but it's not performed. I think I need to use <CR> somehow, but I don't know how.

Reproduce the mapping from settings.json in VS Code using the shown vim.normalModeKeyBindingsNonRecursive entries. Check how the extension handles :m-2 and :m+ after Shift-j and Shift-k; done means both mappings execute rather than only appearing in the Vim command line. No source file or test is named, so first locate the keybinding and command-handling entry point.