<C-d> does not scroll down.

[kollerfuzzi]

Describe the bug
<C-d> does not scroll down, instead it duplicates the line (normal as well as insert mode).

To Reproduce
Steps to reproduce the behavior:
Press <C-d> in normal mode.

Expected behavior
The editor scrolls down half a page

• Extension (VsCodeVim) version: 1.27.2
• VSCode version: 1.88.1
• OS: Linux

Additional context
<C-u> works as expected (scrolling up half a page)
I've configured the extension to handle ctrl keys:
"vim.useCtrlKeys": true,
but same issue.

[jackbunny]

I'm also seeing this issue. I think in my case it has to do with folding. If I expand all the folds in my editor I have no issues with it, but with some of the code collapsed I notice that it will not be working. If I jump to the bottom of a file and then scroll up I can use C-d until I move up to the folded regions again.