Xray does not always work 100%, the red outlines are only visible most of the time when I aim at the tank, the white ones are displayed correctly. Before 1.0.2 the red and orange outlines were displayed without problems.
Normally the target behind a stone will be displayed in white, as soon as the tank is fireable, so if it turns orange then I aim at it red, but as soon as the tank leaves the cover, the outlines disappear instead of switching to orange.