There doesn’t have to be a break in rules symmetry tho. Imagine that universe is a giant dipole of a magic field F, one end of it carries huge field +F the othe

There doesn’t have to be a break in rules symmetry tho. Imagine that universe is a giant dipole of a magic field F, one end of it carries huge field +F the other -F. Next imagine, that presence of +F is likely to precipitate matter from energy, while -F is likely to yield antimatter. Thus a perfectly symmetric system of rules will produce area with only matter and only anti-matter. And blazing inferno in between the two zones. We just need to find out what the F F is.