AuthorizeTransactionPage jumps up when the test tool modal opens

[MelvinBot]

Description

The AuthorizeTransactionPage jumps up when the test tool modal opens.

Reproduction

See the video from the original report: https://github.com/user-attachments/assets/fe0ec080-93be-4c25-9c5c-0a2f639d7a9d

Source

Originally reported in #82704 (comment)

[melvin-bot]

This issue has not been updated in over 15 days. eroding to Monthly issue.

P.S. Is everyone reading this sure this is really a near-term priority? Be brave: if you disagree, go ahead and close it out. If someone disagrees, they'll reopen it, and if they don't: one less thing to do!