[Bug]: When a blogger plan attempts to purchase a non .blog domain, add pro plan to cart instead of personal

[DustyReagan]

Quick summary

On a "Blogger" plan, if you go to purchase a domain, the copy states a "Pro plan required", but when you click Select, a Personal plan is added to the cart.

Steps to reproduce

1. Using a blogger plan site.
2. Go to purchase a domain
3. Click "Select" on a domain that states "Pro plan required".

What you expected to happen

A Pro plan should be added to your shopping cart.

What actually happened

A Personal plan is added to your shopping cart.

Context

No response

Browser

No response

Simple/Atomic

No response

Other notes

No response

Reproducibility

Consistent

Severity

No response

Available workarounds?

No response

Workaround details

No response

[jamiepalatnik]

📌 HOUSEKEEPING

• Labels ✅
• Priority ✅
• Replicable on Core - N/A

📌 SCRUBBING

• Tested on Simple ✅

📌 FINDINGS/SCREENSHOTS/VIDEO

• I was able to recreate this issue, so marking this as triaged for further review.
• Noting that I added the label Low priority because users on the Blogger plan can continue with the Personal plan purchase to be able to use their new domain, choose any other legacy plan from the Plans page, or contact support to upgrade to Starter or Pro plan. But the text "Pro plan required" is confusing since this is not accurate.
• While testing I also noticed that the Personal plan that is added to the cart automatically cannot be removed unless you remove the domain first. This may be expected but I still found it strange since the Remove from cart link shows for the plan but does not work.

📌 ACTIONS

• Marked as Triaged for Quality Squad review

[sirbrillig]

FWIW, the Personal plan is added by the shopping-cart endpoint validator. That validator has this comment:

Users on Blogger plan can only have .blog domains. If they are trying to add something the plan doesn't allow, automatically add Personal.