Reason for a specific part of the tests

[mfranzke]

We couldn't get our heads around why exactly this part of the test was included in this way. Sadly it fails very often these days so we need to mitigate this problem. Please add a comment to this section for future reference.

core-web/showcases/patternhub/tests/default.spec.ts

Lines 27 to 28 in a89a8e9

	const firstH2 = page.locator('h2').first();
	await expect(firstH2).toBeVisible();