Does this issue occur when all extensions are disabled?: Yes, I confirm that I can still reproduce the problem.

• VS Code Version: 1.102.3
• OS Version: macOS Sequoia 15.5

Steps to Reproduce:

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1. Create a text file with the content above.
2. Create an extension with the content below.
3. Debug the extension.
4. Open the text file from step 1.
5. Hover and see that the tooltip shows only one backslash instead of two... 🤔
6. I can also reproduce this problem in Monaco. See here.

import * as vscode from 'vscode';

export function activate(context: vscode.ExtensionContext) {
	context.subscriptions.push(vscode.languages.registerDocumentLinkProvider("plaintext", {
		provideDocumentLinks: () => {
			return [
				{
					target: vscode.Uri.parse("file:///tmp/hello.txt"),
					tooltip: "\\\\a\\\\b\\\\c",
					range: new vscode.Range(1, 0, 1, 5),
				}
			];
		}
	}));
}