I think the following are bugs:
ContourPlot[y (x - 1)^2 == 0, {x, 0, 2}, {y, -2, 10}]
ContourPlot[Exp[-y]*(x - 1)^2 == 0, {x, 0, 2}, {y, -2, 10}]
Please note that I'm not refering to the lack of resolution. I'm talking about the fact that there should be a vertical line $x=1$.
It seems the problem is due to the $(x-1)^2$ term, since without the square, it works fine.


PlotRangeto your example. Observe. – ciao Apr 19 '19 at 20:00PlotRangeand varied xmin, xmax, ymin and ymax, but I don't observe any modification... – AJHC Apr 19 '19 at 20:03