Fix: Failing PHPUnit test

[Mamaduka]

Description

Fixes failing PHPUnit test on trunk. Issue was introduced via #36911, when I forgot to rebase after new test was introduced.

How has this been tested?

Unit PHP test should be passing.

Screenshots

Types of changes

Bugfix

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

[Mamaduka]

I'm going to merge this to unblock development.