[Bug] json code block in markdown has no highlight

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

monaco editor playground link

Monaco Editor Playground Code

// Through the options literal, the behaviour of the editor can be easily customized.
// Here are a few examples of config options that can be passed to the editor.
// You can also call editor.updateOptions at any time to change the options.

var editor = monaco.editor.create(document.getElementById("container"), {
	value: '# aaaa\n\n\n{\n  "type": "object",\n  "properties": {\n    "aaa": {\n      "type": "string",\n      "description": "bbb"\n    }\n  }\n}\n',
	language: "markdown",

	lineNumbers: "off",
	roundedSelection: false,
	scrollBeyondLastLine: false,
	readOnly: false,
	theme: "vs-dark",
});
setTimeout(function () {
	editor.updateOptions({
		lineNumbers: "on",
	});
}, 2000);

Reproduction Steps

Use json code block in markdown editor

Actual (Problematic) Behavior

there is no highlight for json code block in markdown editor

Expected Behavior

highlight for json code block in markdown editor should be exist

Additional Context

No response

Open the linked Monaco Editor Playground and reproduce the missing highlighting in a Markdown editor using the supplied code. Investigate the Markdown editor behavior for JSON code blocks, then verify that JSON content receives syntax highlighting without changing the reported reproduction conditions.