Safari: Lockdown mode causes "start writing" onboarding flow to fail

[annezazu]

Quick summary

When using Safari with lockdown mode enabled, the onboarding flow for https://wordpress.com/setup/start-writing/ fails to load with a minified error. cc @ellatrix who originally found this problem.

Steps to reproduce

1. Enable lockdown mode.
2. Open safari.
3. Go to https://wordpress.com/setup/start-writing/ and try to start creating a site.

What you expected to happen

For the flow to load.

What actually happened

The flow never loaded

Impact

Some (< 50%)

Available workarounds?

No and the platform is unusable

If the above answer is "Yes...", outline the workaround.

No response

Platform (Simple and/or Atomic)

No response

Logs or notes

• Safari
• MacOS

[jartes]

📌 FINDINGS/SCREENSHOTS/VIDEO I checked the Lockdown Mode and it blocks some technologies and browser features:

📌 ACTIONS

• Triaged
• The priority was reduced from Blocker to Low as it is not a widely used Apple feature.

[jsnajdr]

It might have been fixed by #93726. It's the same Redux error (reducer returning undefined) and quite likely to happen when the user account is brand new, just created a moment ago.

Not related to Lockdown mode though, that might have been just a coincidence.

[richtabor]

FYI, there are talks of this flow being deprecated.