ppt source code：
src.zip (3.3 KB)
origin ppt files:
和家手绘风格11.pptx.zip (9.9 MB)
converted problem:
convert error.jpg (479.6 KB)
Please have a check.
I have observed the issue shared by you and request you to please try using Aspose.Slides for Java 20.2 on your end. In case there is still an issue then please fell free to share with us along with Operating System and Java details on your end.