Looks like a broken structure of the 6th slide.
2.8.4 and older version were not sensitive to this problem but for the right work of the last hot fixes
structure can't have errors for correct copying portion and paragraph properties.
I will check if we can write workaround.
Anyway, it's not possible to guarantee right slide cloning in this case.
Alexey Zhilin
Team Leader
Aspose Tyumen Team
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