TestCafe Studio application crashes when resuming recording a coded test with action specified in a separate helper file

I am halfway through the evaluation period of TestCafé Studio, but suddenly encountered an interesting issue.

When I resume recording a test that calls a method from a PO file, TestCafé's UI turns completely black. The code tabs, the explorer, the reports and the top bar (with recording controls) disappear. The menu bar is still visible though. The browser window opens, methods from PO files are still executed and interactions are still recorded. If I close and restart TestCafé all the recorded input is there.

This used to work fine in the previous version of TestCafé.
The issue occurs with Chrome 93.0.4577.63 (64-bits) and Firefox 92.0 (64-bit).
Running tests that include method calls from PO files works fine.

Code
import { Selector, t } from 'testcafe';
import { Page, TestData } from './helpers';
*[...]*

var page: Page;
*[...]*

fixture `Some fixture`
    .page `http://localhost:4200`
    .before(async () => {
        page = new Page();
        *[...]*
        });

test('Register values', async (t: TestController) => {
    await page.login(TestData.adminCredentials);

Code
import { Selector, t } from 'testcafe';

export class Page {

    constructor() {  }

    public async login(credentials) {
        await t
            .typeText(Selector('.dx-texteditor-input').nth(0), credentials.username)
            .typeText(Selector('.dx-texteditor-input').nth(1), credentials.password)
            .click('.dx-button');
    }

        public async logout() {
        await t
            .click(Selector('[name="userButton"] div'))
            .click(Selector('span').withText('Logout'))
    }

    *[...]*
}

export class TestData {
    public static readonly adminCredentials = { username: 'admin', password: '*[...]*' }
    public static readonly testUserCredentials = { username: 'E2ETestUser', password: '*[...]*',
        firstname: 'Test', lastname: 'User', isactive: true, role: 'User', email: 'bla@bla.com' }
        [...]
}