How to Favicon | Hugonweb Annotated Link Bibliography
https://evilmartians.com/chronicles/how-to-favicon-in-2021-six-files-that-fit-most-needs
Dozens of images aren't required for a favicon. The article recommends 6, but I would try just .ico at only 32x32 and a SVG.
Includes a description of the files required and why, as well as how to generate them with Inkscape and Gimp.