How many string type fields can be written in a compound dataset in HDF5 file?

Question

I am using Hdf5DotnetTools, a C# wrapper on HDF.Pinvoke version 1.10. in Windows 10 and HDFViewer version 3.0.

I ran the test cases in Debug mode and found that

1. only one string type field can be written in a compound dataset. inside the HDFviewer 3.0
2. if two string type fields are written in the compound dataset, only one letter appears in both the columns. (Notice location column and fourth value of label column)

But when I read same compound dataset file running the test cases in debug mode, the strings are entirely safe inside the variable.

How can I see the full string data in the viewer?
How to write any multi-column string in one dataset?