Awaiting for hydration in Playwright+SvelteKit tests has improved test repeatability for me. I wrote about it here. www.sveltevietnam.dev/en/blog/2026...
sveltevietnam.devHydration Assertion in Tests with SvelteKit & PlaywrightDetect problematic page load early and reduce flakiness by checking and waiting for hydration in Playwright E2E/UAT tests