"Simple" keybindings for Dvorak lead to regular crashing of vim extension - any suggestions appreciated :)

Describe the bug
Ok so I was super happy to see that some headway had been made on key mappings so that I could make some small changes so I can more easily use VSCode + Vim + Dvorak. So a big thanks for all the contributors hard work to make VSCodeVim a reality.

Unfortunately something I have done leads to regular crashes of the extension. When this happens I disable and re-enable the extension and it rights itself.

Generally it crashes when I am trying to do multi-line stuff or multi-select stuff, at least I think...

To Reproduce
Steps to reproduce the behavior:

Heres my complete settings file.

Additionally I do have a few extensions installed - for different languages, but no snippets libraries or such that may conflict with vim.

{
    "todo-tree.tree.showScanModeButton": false,
    "vim.easymotion": true,
    "vim.incsearch": true,
    "vim.useSystemClipboard": true,
    "vim.useCtrlKeys": true,
    "vim.hlsearch": true,
    "vim.insertModeKeyBindings": [
        {
            "before": ["h", "h"],
            "after": ["<Esc>"]
        }
    ],
    "vim.normalModeKeyBindings": [
        {
            "before": ["h"],
            "after": ["h"]
        },
        {
            "before": ["t"],
            "after": ["j"]
        },
        {
            "before": ["n"],
            "after": ["k"]
        },
        {
            "before": ["s"],
            "after": ["l"]
        },
        {
            "before": ["H"],
            "after": ["0"]
        },
        {
            "before": ["T"],
            "after": ["L"]
        },
        {
            "before": ["N"],
            "after": ["H"]
        },
        {
            "before": ["S"],
            "after": ["$"]
        },
        {
            "before": ["j"],
            "after": ["n"]
        },
        {
            "before": ["J"],
            "after": ["N"]
        },
        {
            "before": ["k"],
            "after": ["s"]
        },
        {
            "before": ["K"],
            "after": ["S"]
        }
    ],
    "vim.visualModeKeyBindings": [
        {
            "before": ["h"],
            "after": ["h"]
        },
        {
            "before": ["t"],
            "after": ["j"]
        },
        {
            "before": ["n"],
            "after": ["k"]
        },
        {
            "before": ["s"],
            "after": ["l"]
        },
        {
            "before": ["H"],
            "after": ["0"]
        },
        {
            "before": ["T"],
            "after": ["L"]
        },
        {
            "before": ["N"],
            "after": ["H"]
        },
        {
            "before": ["S"],
            "after": ["$"]
        },
        {
            "before": ["j"],
            "after": ["n"]
        },
        {
            "before": ["J"],
            "after": ["N"]
        },
        {
            "before": ["k"],
            "after": ["s"]
        },
        {
            "before": ["K"],
            "after": ["S"]
        }
    ],
    "vim.leader": "<space>",
    "vim.handleKeys": {
        "<C-a>": false,
        "<C-f>": false
    },
    "git.enableSmartCommit": true,
    "files.autoSave": "onFocusChange",
    "window.zoomLevel": 1,
    "git.confirmSync": false,
    "codestream.email": "dan.lewis@bamboocreative.nz",
    "javascript.updateImportsOnFileMove.enabled": "always",
    "explorer.confirmDragAndDrop": false,
    "typescript.updateImportsOnFileMove.enabled": "never",
    "editor.tabSize": 2,
    "compile-hero.disable-compile-files-on-did-save-code": true
 }

Expected behavior
It just works :)

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.16.0
• VSCode version: 1.48.2
• OS: osx 10.15.6

Start by reproducing the crash in VSCodeVim 1.16.0 with the supplied keybindings on VSCode 1.48.2 under macOS 10.15.6, focusing on multiline and multi-select operations. Compare behavior with the listed settings and determine what consistently triggers the extension failure; done means those operations no longer regularly crash the extension.