Reload existing CGNS file leads to crash
I have noticed that when a CGNS file is loaded and the user right-clicks on the reader source and selects "Reload files" -> "Reload existing", that ParaView crashes. I have tracked this to the fact that vtkCGNSFileSeriesReader::SetReader(vtkCGNSReader) is called with nullptr, after which vtkCGNSFileSeriesReader::ClearBlockStatus is called, where the Reader member is then null.
This may have something to do with how the file series reader is implemented (it does not inherit from vtkFileSeriesReader and all other file series readers use this class) and/or how it is exposed in the CGNSReader.xml file, but I am not knowledgeable enough to fix this.
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