Why the UIView extension doesn't work using combine?

Question

My Problem :

When I use UIView extension about Combine, It doesn't work. But use TabGesture extension, it works. I don`t know why..

UIGestureRecognizer file

When I do this, the publisher doesn't work. But, If I do this(change tabPublisher -> tapPublisher()), the code works. I don't know why..!