vscode: CompletionItem commands no longer work if added during resolve (regression)

This code produces a completion item and adds a command during resolve (which just shows an alert).

In the latest VS Code, this command does not fire when the completion item is selected, unless it is attached in the original provideCompletionItems call.

import * as vscode from 'vscode';

export function activate(context: vscode.ExtensionContext) {
	context.subscriptions.push(vscode.commands.registerCommand('vscode-repro-completion-commands.helloWorld', () => {
		vscode.window.showInformationMessage('Hello World from vscode-repro-completion-commands!');
	}));

	context.subscriptions.push(vscode.languages.registerCompletionItemProvider(
		{ scheme: 'file' },
		{
			provideCompletionItems(doc, pos, token) {
				const completionItem = new vscode.CompletionItem("ProcessResult");
				// Attaching the command here works:
				// completionItem.command = {
				// 	command: "vscode-repro-completion-commands.helloWorld",
				// 	title: "add imports",
				// };

				return new vscode.CompletionList(
					[completionItem],
					false,
				);
			},

			resolveCompletionItem(oldItem) {
				const completionItem = new vscode.CompletionItem("ProcessResult");
				// Attaching the command here does not work.
				completionItem.command = {
					command: "vscode-repro-completion-commands.helloWorld",
					title: "add imports",
				};

				return completionItem;
			}
		},
	));
}