"favicon" folder is missed after building and deployment

If I run locally the same “npm run build” command, all the folders/files will be in place, but when using Netlify, the “favicon” folder and all its files are simply not there, as if it is ignored by Netlify.

GitHub Repo: GitHub - Rock-n-Roll-CRC/FM-Contact-Form: Form with several input types and validation.
Deployment Log: Netlify
Live Website: https://fm-contact-form-danil-dikhtyar.netlify.app/

This thread is also a duplicate, I have provided a detailed answer here: