Charts pasted from spreadsheets corrupt the file

After updating Aspose.Words for .Net from 21.3 (to both 21.4 and 21.5) we have encountered the following issue:
After users paste-in charts from xlsx spreadsheets into word documents, the most basic manipulation of the file results in an unrecoverable document.
Code sample:

Aspose.Words.Document doc = new Aspose.Words.Document(input);
doc.Save(output);

I have attached a reproduceable set of files, the result after the basic save operation and the usage from the users perspective.chart_issue.zip (857.0 KB)

@HIGHSTAGE

We have tested the scenario and managed to reproduce the same issue at our side. For the sake of correction, we have logged this problem in our issue tracking system as WORDSNET-22303. You will be notified via this forum thread once this issue is resolved.

We apologize for your inconvenience.

The issues you have found earlier (filed as WORDSNET-22303) have been fixed in this Aspose.Words for .NET 21.7 update and this Aspose.Words for Java 21.7 update.