[Bug] Handlebars syntax highlighting broken since version 0.35.0

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

Playground with unexpected brackets highlighing {{{ }}}
https://microsoft.github.io/monaco-editor/playground.html?source=v0.35.0#XQAAAAJ5AQAAAAAAAABBqQkHQ5NjdMjwa-jY7SIQ9S7DNlzs5W-mwj0fe1ZCDRFc9ws9XQE0SJE1jc2VKxhaLFIw9vEWSxW3yscwzhsWG_1uhs0-3YGTBOsVJ4S4FwfCDQb5-2uUHXTVAefbVSd9IzaZ_vv9VR9KugsKicTKQ1OZgR4qMzYNG8oY_AkxFezfwWHwjDKVy3_uJ9AWb9KOwnA_ApXsDWPrV6CNfDprrH-007Gez0wm4FzXaZQQQ7y0Syg6uTw9urDuwR6z7WMtYEbZq2_Y9nbft1OLEbDqnwh8TKzjfDtcG6cBrapgfOLJ2AM045qGXGvaT6_jK4UWrD4WcDZwWEkMebOW9oCINNMYJFaITG8ntsjHU_zpJ9ooQK7LFjOlvNNin3V5UP_fQSIL

Monaco Editor Playground Code

const value = /* set from `myEditor.getModel()`: */ `

{{#blockHelper}}

{{ escaped }}

{{{ unescaped }}}

{{/blockHelper}}
`;

// Hover on each property to see its docs!
const myEditor = monaco.editor.create(document.getElementById("container"), {
	value,
	language: "handlebars",
	automaticLayout: true,
});

Reproduction Steps

1. Use handlebars tripple curly brackets for unescaped output
2. Switch between editor version 0.34.1 (as expected) 0.35.0 and latest stable (not as expected)

Actual (Problematic) Behavior

Expected Behavior

Additional Context

In addition to the red coloring of the tripple curly brackets, you can also notice that brackets are colored in blue in general and not black as expected.

Start with the linked Monaco Editor Playground reproduction and compare syntax highlighting for the same Handlebars sample in versions 0.34.1, 0.35.0, and the latest stable release. Trace the Handlebars language highlighting entry point from the playground configuration, then verify that triple curly brackets and ordinary brackets receive the expected colors.