Your Constant 1 Vector node is called Constant. Simply because it is not a vector but a float value. And it never had yellow color. Always used to be green.
For masked materials, opacity mask black values define transparent regions, not white ones.
Your Constant 1 Vector node is called Constant. Simply because it is not a vector but a float value. And it never had yellow color. Always used to be green.
For masked materials, opacity mask black values define transparent regions, not white ones.