Failed to handle key=u. The first argument must be o... | VSCodeVim/Vim

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To Reproduce
when setting
{
"before": [
"",
"g",
"u"
],
"commands": [
"java.action.navigateToSuperImplementation"
]
}
Steps to reproduce the behavior:

Go to '...'
Click on '....'
Scroll down to '....'
See error

VSCodeVim version: 1.17.1

Stack trace

TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be one of type string, Buffer, ArrayBuffer, Array, or Array-like Object. Received type undefined
	at Function.from (buffer.js:305:9)
	at t.StandardLanguageClient.<anonymous> (c:\Users\416\.vscode-insiders\extensions\redhat.java-0.70.0\dist\extension.js:15:79302)
	at Generator.next (<anonymous>)
	at c:\Users\416\.vscode-insiders\extensions\redhat.java-0.70.0\dist\extension.js:15:72286
	at new Promise (<anonymous>)
	at r (c:\Users\416\.vscode-insiders\extensions\redhat.java-0.70.0\dist\extension.js:15:72031)
	at c:\Users\416\.vscode-insiders\extensions\redhat.java-0.70.0\dist\extension.js:15:78660
	at _executeContributedCommand (c:\Users\416\AppData\Local\Programs\Microsoft VS Code Insiders\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:701:753)
	at _doExecuteCommand (c:\Users\416\AppData\Local\Programs\Microsoft VS Code Insiders\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:700:867)
	at _.executeCommand (c:\Users\416\AppData\Local\Programs\Microsoft VS Code Insiders\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:700:773)
	at Object.executeCommand (c:\Users\416\AppData\Local\Programs\Microsoft VS Code Insiders\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:996:29)
	at f.handleRemapping (c:\Users\416\.vscode-insiders\extensions\vscodevim.vim-1.17.1\out\extension.js:9:501849)
	at f.sendKey (c:\Users\416\.vscode-insiders\extensions\vscodevim.vim-1.17.1\out\extension.js:9:499795)
	at t.Remappers.sendKey (c:\Users\416\.vscode-insiders\extensions\vscodevim.vim-1.17.1\out\extension.js:9:496237)
	at runMicrotasks (<anonymous>)
	at processTicksAndRejections (internal/process/task_queues.js:94:5)
	at async F.handleKeyEvent (c:\Users\416\.vscode-insiders\extensions\vscodevim.vim-1.17.1\out\extension.js:9:471257)
	at async Object.promise (c:\Users\416\.vscode-insiders\extensions\vscodevim.vim-1.17.1\out\extension.js:9:235740)
	at async Object.runTasks (c:\Users\416\.vscode-insiders\extensions\vscodevim.vim-1.17.1\out\extension.js:9:621914)

Reproduce the key mapping using the shown before/commands configuration and inspect the key-remapping path named in the stack trace, including handleRemapping and sendKey in the extension output. Compare the behavior with the Red Hat Java command and determine why executing it leads to an undefined value; done means the mapping runs without the reported TypeError.

Written by the indexing model from the issue text.

Failed to handle key=u. The first argument must be one of type string, Buffer, ArrayBuffer, Array, or Array-like Object. Received type undefined

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