Bug 473554

SUMMARY
When I open a folder in dolphin with a thumbnail view enabled that contains this pdf [1], a "gs" process runs that fully consumes on of the cpu cores. It runs for a while (seconds), and sometimes it seems that when it stops a new one is started again, so this goes on for a while.
When I encountered this for the first time, I didn't have this folder open at all, and I had three of them running in parallel, heating up my cpu enough for me to notice this issue. I don't know if I had previously opened the folder since the last reboot though (I often go days, sometimes weeks without reboot). So maybe this can even happen during background-preparation of thumbnails or something?
The pdf itself opens without problems in Okular and mupdf.

[1] https://www.weishaupt.de/uploads/tx_weishaupt_documents/documents/83247601_10_16.pdf

STEPS TO REPRODUCE
1. download pdf: https://www.weishaupt.de/uploads/tx_weishaupt_documents/documents/83247601_10_16.pdf
2. open folder containing the pdf with dolphin with thumbnails enabled

OBSERVED RESULT
gs process with high cpu load spawned/possibly respawned
full command according to "ps aux", edited for privacy:
gs -sDEVICE=png16m -sOutputFile=- -dSAFER -dPARANOIDSAFER -dNOPAUSE -dFirstPage=1 -dLastPage=1 -q - /home/me/path/83247601_10_16.pdf -c showpage -c quit

EXPECTED RESULT
no high cpu usage or only for a short time

SOFTWARE/OS VERSIONS
Kernel Version: 6.4.11-arch2-1 (64-bit)
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10

ADDITIONAL INFORMATION