Thailand Laos and Cambodia have very similar traditions, it can be said that they are very much the same, and I really love this tradition very much, our three countries are brothers next door. 🇹🇭🇰🇭🇱🇦😍🤩
at 5:58, this may just answer to your question: this version just be one of the many stories, but the story i have heard is an egg symbolizes the beginning of a family and therefore it's appropriate an egg is eaten during the wedding ceremony.
New wedding couple feed egg to each other during ceremony is believed from generation that couple will have children example like chicks are born from chicken mother eggs same as new wedding couple eat the egg to have children