Problem with .AVIF files:  8-bit > 16-bit

Problem with .AVIF files
The application accepts an 8-bit file, but outputs 16-bit AVIF.
This makes no sense and it creates a problem when creating a preview on a website using the GD and Imagemagic libraries


<img width="871" height="656" alt="Image" src="https://github.com/user-attachments/assets/5da937a6-f563-4ac9-aad8-ff03f3d5a745" />