I have worked with the image file shared by you and have been able to observe the issue specified. An issue with ID SLIDESNET-40194 has been created in our issue tracking system to further investigate and resolve the issue. This thread has been linked with the issue so that you may be automatically notified once the issue will be fixed.
I like to share that the issue has just recently been created and is pending for investigation in issues queue. we request for your patience till the time the issue gets resolved.
I have observed your comments. I regret to inform that issue is still unresolved. This issue is scheduled for investigation at the end of August. The ETA will be shared after the investigation. I request for your patience. We will share good news with you soon.
As you mentioned earlier that this issue will be resolved by the end of august. Could you please confirm if this has been resolved now in the latest release.
I have verified from our issue tracking system and like to share that the concerned issue has been marked as resolved in upcoming Aspose.Slides for .NET 18.9. We will share the good news with you as soon as the product will be available for download by end of this month.