Converting a particular .pptx to pdf multiple times produces different .pdf files

[awidesky]

Tried to test document conversion from pptx to pdf via following command :

soffice --headless --convert-to pdf Extlst-test.pptx

The input file was a test document from The Document Foundation org.
However, if I execute the same command again, the output pdf file has difference size than the other(first was 67.4 KB, second was 96.8 KB).
Those files look alike, but pdfcompare says there are some differences on edges.

Is the pptx file bad or it’s a bug of soffice?
I’m using LibreOffice 24.2.5.2 bffef4ea93e59bebbeaf7f431bb02b1a39ee8a59 from homebrew on MacOS.

[mikekaganski]

I can’t reproduce with Version: 24.8.0.2 (X86_64) / LibreOffice Community
Build ID: 57ceca7d2eefdf83e7c9b4135a017f3361a8133f
CPU threads: 24; OS: Windows 11 X86_64 (10.0 build 26100); UI render: default; VCL: win
Locale: en-US (ru_RU); UI: en-US
Calc: CL threaded

(so might be version-specific or OS-specific). I tried to export several times; both with and without LibreOffice running in the background (which could be important, because running it in the background, the same process would handle both commands).

The generated PDFs were indeed different (because they include a timestamp and a checksum); but their sizes were identical (the differing timestamp and checksum strings take same size), and there was no other differences.