Using a hyperlink with Japanese characters is converted to URL encoding:
Output: <C: % E 3% 83% 86% E 3% 82% B 9% E 3% 83% 88% E 7% 94% A 8% E 3% 83% 95% E 3% 82% A 9% E 3% 83% AB% E 3 % 83% 80>
I have attached e sample c# project to replicate the issue and the images that show the difference.
I have worked with source code and presentation file shared by you using Aspose.Slides for .NET 17.8 and have been able to observe the issue. A ticket with ID SLIDESNET-39317 has been created in our issue tracking system to further investigate and resolve the issue. This thread has been linked with issue so that you may be automatically notified once issue will be fixed.
We are sorry for your inconvenience,