This ensures a clean state for the extension currently being tested. The alternative requires the user to create and keep track of multiple test databases, or manually delete/re-recreate the database every time they switch between extensions being tested. Now, a simple `composer test:setup` will always reset the test environment to the original state.
It's not causing any issue because the correct variable name is always used to set and read the value, and PHP is fine setting new attributes on a class dynamically. It's just the explicit variables declared don't match with those actually used later.
