Iso surface truncated by new "topo" method

During the same run in an external aerodynamics application, I have tried to use the new isoSurfaceTopo method to extract and visualize turbulent structures via Lambda2, which resulted in a troncated iso-surface near the object, as shown in the picture attached (orange is Lambda2 via standard isoSurface and blue Lambda2 via isoSurfaceTopo).

## Reattaching the author to the issue ticket: @Ricky-11 ##

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