Presentation loses transparent background image when printed as PDF

[shu0406]

This issue is unique.

• I have used the search tool and did not find an issue describing my bug.

Operating System of DocumentServer

Linux (DEB package)

Version information

docs 8.1.1 + desktop editor 8.2.1

Expected Behavior

Presentation with transparent background image f.e. 10% transperancy. When printing as PDF, exporting as PDF, save as PDF in nextcloud, the PDF should have the same transparent background image.

Actual Behavior

If there are more slides than 1 it has just blank white background. If it has just 1 slide it works. Reproduced for printing as PDF, exporting as PDF, save as PDF in nextcloud. In the print view it already disappeard (screenshot below, little robot disappears). pptx attached.

Presentation with image.pptx

Reproduction Steps

No response

Additional information

No response