axe-core ignores elements outside body bounding box when body has `overflow: hidden`

### Product

axe-core

### Product Version

_No response_

### Latest Version

- [X] I have tested the issue with the latest version of the product

### Issue Description

#### Expectation
All elements in should get tested with tests relevant to them. If a button inside a modal had color contrast issues it should be reported.

#### Actual
It seems like elements that have position: fixed or position: absolute are not tested.

#### How to Reproduce
I made a simple [reproduction](https://github.com/marianntapfer/brick-ui/pull/5) in this test component library.

#### Additional context
I got then issue when using Storybook's addon-a11y and axe-playwright in Storybook testrunner.