Hi Ngô Kiên,
Upon checking the input document provided, we noticed that the first chart is a
Funnel chart. Currently, DocIO does not support Funnel charts. Instead, it uses
a fallback image (available at the file level) when saving the document. As a
result, the chart will be preserved as an image. We have logged this as a
feature request titled “Provide support for Treemap, Sunburst, Histogram,
Histogram (Pareto), Box & Whisker, and Funnel charts in DOCX” in our
database. Currently we don’t have any immediate plans to implement this
feature.
The status of the feature report can be tracked through the below link:
Provide
support for Treemap, Sunburst, Histogram, Histogram (Pareto), Box &
Whisker, and Funnel charts in DOCX in WinForms | Feedback Portal
Regards,
Sindhu Ramesh.