Does not work with quasar/app-webpack v4 (beta)

[sonicviz]

Describe the bug
A clear and concise description of what the bug is.

Create a new basic Quasar quickstart project as described here: https://quasar.dev/quasar-cli-webpack/upgrade-guide.
npm init quasar
When asked to "Pick Quasar App CLI variant", answer with: "Quasar App CLI with Webpack (BETA | next major version - v4)".

Adding quasar-ui-markdown via quasar ext add @quasar/qmarkdown@next

Results in the following error:
App • Installing "@quasar/qmarkdown" Quasar App Extension

App • Installing @quasar/quasar-app-extension-qmarkdown@next...
App • [sync] Running "npm install --save-dev @quasar/quasar-app-extension-qmarkdown@next" in E:\Source Control\AI Apps\My Quasar Apps\quasar-project

added 34 packages, and audited 952 packages in 9s

195 packages are looking for funding
run npm fund for details

found 0 vulnerabilities
node:path:433
validateString(arg, 'path');
^

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined
at join (node:path:433:7)
at #getScriptFile (E:\Source Control\AI Apps\My Quasar Apps\quasar-project\node_modules@quasar\app-webpack\lib\app-extension\AppExtensionInstance.js:346:22)
at #getScript (E:\Source Control\AI Apps\My Quasar Apps\quasar-project\node_modules@quasar\app-webpack\lib\app-extension\AppExtensionInstance.js:358:39)
at #getScriptPrompts (E:\Source Control\AI Apps\My Quasar Apps\quasar-project\node_modules@quasar\app-webpack\lib\app-extension\AppExtensionInstance.js:304:51)
at AppExtensionInstance.install (E:\Source Control\AI Apps\My Quasar Apps\quasar-project\node_modules@quasar\app-webpack\lib\app-extension\AppExtensionInstance.js:218:49)
at async runExtAction (E:\Source Control\AI Apps\My Quasar Apps\quasar-project\node_modules@quasar\app-webpack\lib\cmd\ext.js:69:3) {
code: 'ERR_INVALID_ARG_TYPE'
}

Node.js v20.12.2

This will then cause errors in md files when you try to run quasar dev
eg: Module parse failed: Unexpected character ' ' (1:1)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders

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To Reproduce
Steps to reproduce the behavior:
Create a new basic Quasar quickstart project as described here: https://quasar.dev/quasar-cli-webpack/upgrade-guide.
npm init quasar
When asked to "Pick Quasar App CLI variant", answer with: "Quasar App CLI with Webpack (BETA | next major version - v4)".
let it create the project
CD into the new project
Run quasar ext add @quasar/qmarkdown@next and receive your new error

Expected behavior

Expect it to not error, and work correctly as it does in "@quasar/app-webpack": "^3.14.2",

Screenshots

Desktop (please complete the following information):

• OS: Win 11 X64 Pro 23H2 latest

Additional context
Add any other context about the problem here.