JWST Image Contains Photo Bombing Galaxy That Should Not Exist

<img width="128" height="52" src="https://www.sciencealert.com/images/2024/02/dwarf_galaxy_PEARLSDG.jpg" alt="up close image of PEARLSDG"/>
How did that get there?

https://www.sciencealert.com/jwst-image-contains-photo-bombing-galaxy-that-should-not-exist