Known. The beer was thick and cloudy, more like porridge than a drink today.
The pots come from Hierakonpolis, also called Nekhen, in southern Egypt. The pieces date to between 3800 and 3600 BC, about 5,800 years ago. That was about 600 years before Egypt was one state under Narmer. Tests on broken pottery found starch, yeast, and plant traces from beer. It was brewed from wheat, barley, and grass, and it was low in alcohol. Five straw-coloured jars with flat bases seem to have stored it. Four black-topped cups seem to have been for drinking.
The study says this beer was also used in rituals.
The page does not say what is still argued.
https://www.ancient-origins.net/news-history-archaeology/egyptian-beer-0016160