volume rendering by vector component/magnitude not working on rectilinear grid
Attached is a little file that creates a trivial rectilinear grid. Import the result, pass it through the calculator with a result name of 'vector' and an equation containing simply 'coords'. Using the GUI, select volume rendering by a component or by Magnitude and you get errors and no image. Pass the result through the AppendDatasets filter to convert it to an unstructured grid, and you can volume render by either individual component or by Magnitude.vtr.py
By the way, this is v. 5.9.1 and on a Mac running Big Sur.