`<C-k>` doesn't work in navigating through vscode autcomplete list but `<C-j>` does.

Describe the bug
After freshly installing vscode vim, and making 0 configurations to it, the following issue occurs:

When trying to navigate through vscode autocomplete menus, the keybindings <CTRL>+j and <CTRL>+k are automatically implemented into the vim extension to move down and up autocomplete menus respectively.

<CTRL>+j moves down the autocomplete list perfectly fine and there is no issue with its functionality, but upon pressing <CTRL>+k when an autocomplete menu is active, instead of moving up the autocomplete list as expected, it simply waits for the next key input as if the keybinding doesn't exist.

I have only tested this in python files, so I am not sure if this issue appears in other file types.

To Reproduce
Steps to reproduce the behavior:

1. Create an empty python file (name doesn't matter).
2. Paste the following code into the file:

my_var_1 = 1
my_var_2 = 2
my_var_3 = 3

3. Create a new line and type my, which should result in an autocomplete menu appearing with the three variables made in step 2 as autocomplete options.
4. Use <CTRL>+j to move down the list. It should work fine.
5. Use <CTRL>+k to move up the list. For me, on this step, nothing happens, as described in the bug description.

Expected behavior
When an autocomplete menu is active, pressing CTRL+k should move up one option in the menu.

Screenshots

After I finish pressing <CTRL>+j, notice how in the status bar at the bottom, <CTRL>+k repeatedly flashes. This shows that I am pressing <CTRL>+k but it is not registering as a command to move in the autocomplete menu.

Environment (please complete the following information):

• Issue Type: Bug
• Extension Name: vim
• Extension Version: 1.21.6
• OS Version: Windows_NT x64 10.0.19042
• VS Code version: 1.59.0

Start by reproducing the issue in VS Code using the Python example and the listed Ctrl+j/Ctrl+k keybindings. Trace the extension's autocomplete navigation and keybinding handling; the fix is done when Ctrl+k moves up the active completion list as Ctrl+j moves down.