The "favicon" folder is excluded during the building process

Netlify site name: https://fm-contact-form-danil-dikhtyar.netlify.app/
Logs:


GitHub repo: GitHub - Rock-n-Roll-CRC/FM-Contact-Form: Form with several input types and validation.

All the files and all the folders (excluding the “favicon” folder) which should be created by using “npm run build” command are in place, after the building process. Why it gets ignored? And how do I fix it?

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