[Experiment] The FxA Sign In page is not pre-filled for existing accounts after performing a breach search with the checkbox ticked

[heres-maria-sv-inactive]

[Affected Versions]:

• Firefox Release 74.0, Build ID 20200309095159
• Firefox Preview (Fenix) 4.1.0 Build #20771637

[Affected Platforms]:

• Windows 10 (x64)
• Motorola One Vision - Android 10

[Prerequisites]:

• You are on the Version C: Opt Out page.
• You have not performed a breach search, nor have you signed into an account until now.

[Steps to reproduce]:

1. Enter an email associated with an existing account in the “Enter Email Address” field.
2. Click the “Check for Breaches” button.

[Expected results]:

• The "Sign In" page is displayed, with the email pre-filled.

[Actual results]:

• The “Enter your email” page is displayed.

[Notes]:

• This issue is also reproducible for Version B: Opt In, if the checkbox is ticked.
• This issue is not reproducible if a breach search has been previously performed (whether using the same email or not) with the checkbox unticked or if a sign-in was previously performed.
• This issue is not applicable for Version A: Control.
• Attached is a recording of the issue.

[heres-maria-sv-inactive]

I have verified that this issue is no longer reproducible using Firefox Beta 75.0b1 Build ID 20200309155231 on Windows 10 (x64) as well as Firefox 68.6.0 on Android 9 (Samsung Galaxy S8).
An email for an existing account is now prefilled.
As a result, I am closing this issue.