Plot Data of multiblock dataset is broken

The Plot Data of multiblock datasets is broken. Here is how to replicate:

Master (June, 2019), Linux, remote server (16 ranks).
Load g1s1. All vars on. Turn on ONLY block 1. Apply.
Go to timestep 1.
Plot Data. Apply. Notice that the correct block is chosen. Nice.
Unselect Use index for XAxis. Change Array Name to VEL_Y.
Turn off all Series Parameters. Turn on only VEL_Y.

This is a bug. You will see nothing painted in the Line Chart View. You should see (as per the Information tab) a line go from the lower left to the upper right, with data running on both axis from about -13 to -10.

The way around this is to convert the data from being a multiblock dataset with the MergeBlocks filter.

Impacting Watney.

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