Neither is optional as I said, because another research
needs it completed.
Yes, Ornate Street only goes to SS+ 13, but that very
research needs 3 things completed ahead. SSM also
needs 2 things completed, not just the street.
Your 2nd pic is , uhhhhh, fake .....
Here is CH6, where an example of what you want
is. Both are Optional and that seems clear to me.