Incorrect graphics for Implicit function

Something’s not working the way it seems like it should.

When I try to see the graphic solution for the Implicit function (y-1)(y-x) = 0

I saw that the graphics accounts only for y-x = 0 and didn’t show the (y-1) = 0 solution.

And here are some screenshots or a video:

The current graphics:

The correct graphics:

I noticed something similar: Some graphs, the ones I could find being xy=x and xy=0, do not recognize the solutions where x=0 and y can be anything. Graphing Calculator