ExtractBlock does not Propagate Global Field Data
ExtractBlock does not Propagate Global Field Data. To recreate, open vtm file in attachment MultiBlockExample.tbz. ExtractBlock, pick any block : top, middle, bottom, or grid. Note that global field data in the top level dataset grid_0001.vtm is no longer available.
I think it would be OK, if this one filter didn't propagate field data in certain circumstances, looking at can.ex2 this might be as clear as mud. The can block appears to have its own global field data and name collisions could occur. So perhaps if there is a name collision, ParaView could either not propagate or preface the parent info with parent_?