addSelectionToNextFindMatch shortcut (ctrl+d) does not work in Visual Line mode

Describe the bug
Note that I have the following settings:

...
  "vim.useCtrlKeys": false,
  "vim.handleKeys": {
    "<C-c>": false,
    "<C-d>": false,
    "<C-u>": false,
    "<C-v>": false,
  },
...

When an entire line of text is selected with shift+v and when I try to select the next match with ctrl+d, the text does not get selected

In contrast, this works fine if the text is first selected with a mouse and ctrl+d is pressed
OR
the text is selected (in visual mode) with v + nav key (h,j,k,l) and ctrl+d is pressed

To Reproduce
Steps to reproduce the behavior:

1. Open/create a file that has lines of duplicated text.
   ie.

sample text
sample text
sample text
....

2. Navigate to the first line and press shift+v
3. Once the line is selected as per step 2, press ctrl+d
4. Watch as the shortcut fails

Expected behavior
I expect subsequent lines of duplicated text to be selected

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.14.5
• Version: 1.45.1 (user setup)
• OS: Windows_NT x64 10.0.18363

Additional context
Also, this might be related/duplicate of issue #4277

Start by reproducing the failure with Shift+V followed by Ctrl+D in Visual Line mode, using the reported vim.useCtrlKeys and vim.handleKeys settings. Compare it with mouse selection and characterwise visual selection, then trace the addSelectionToNextFindMatch shortcut handling; done means duplicated subsequent lines are selected consistently.