White area in Mathematica ListPlot

When I create and plot this list:

var = 2;
okList = {{0.8, var, 0.8, 0.8}, {0, 0.3, 0.6, 0.9}, {0, 1, 2, 3}};
lp = ListDensityPlot[okList, ColorFunction -> "SandyTerrain"]

or, unscaled, like this:

lp = ListDensityPlot[okList, ColorFunction -> "SandyTerrain",
     ColorFunctionScaling -> False]

I get a开发者_高级运维 fully coloured square, as I'd expect.

But when I try this:

var = 0.8;
list = {{0.8, var, 0.8, 0.8}, {0, 0.3, 0.6, 0.9}, {0, 1, 2, 3}};
problem = ListDensityPlot[list, ColorFunction -> "SandyTerrain"]

I get a white patch in the corner.

which plotting with ColorFunctionScaling->False doesn't get rid of

The ColorFunction SandyTerrain doesn't have any white in it, so this must be ListDensityPlot not plotting anything in that area.

What could cause this to happen, and how do I stop it?

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It's getting clipped by the automatic plot range calculation. Try with PlotRange -> All or ClippingStyle -> Automatic.