The type of ySplit in the pane is set as row_t, but it should be some fractional type. This causes the following error.

terminate called after throwing an instance of 'xml::parsing'
   what():  xl/worksheets/sheet2.xml:2:656: error: invalid value '1.0'

https://docs.microsoft.com/en-us/previous-versions/office/developer/office-2010/cc880269(v%3Doffice.14)

https://github.com/tfussell/xlnt/blob/master/source/detail/serialization/xlsx_consumer.cpp#L515

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