Why do Simulation plots have a "polka dot" appearance with low order elements in Simulation at 11.0?

Switching from high- to low-order elements for some of the parts using command snippets will cause this behavior. Simulation is trying to display results at non-existent mid-side nodes. A new feature at 11.0 is an advanced meshing option to drop mid-side nodes on a part-by-part basis. That will avoid the postprocessing incompatibility you encountered.

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