Link validator is saying URLs are valid, even if they're 404'd

<img width="1920" height="1057" alt="Image" src="https://github.com/user-attachments/assets/774b3895-39dc-493b-82e2-041d0d5f9999" />

<img width="184" height="90" alt="Image" src="https://github.com/user-attachments/assets/3def871f-b5f4-4fd6-b266-01b7f1645710" />

URL in question:

https://steamusercontent-a.akamaihd.net/ugc/9803278608372465475/6A75E9D88BEF84526F9B136214CFD5F9F5A46BDA/