Some PDF graphics/images have black circles rendered in the upper left corner

The latest version of Zotero is just awesome, and the pdf viewer is certain an extra bonus for one with much papers to go through.

A potential bug is proposed here as it is indicated in the dicussion title. I came across some pdf files, black circles are likely to be rendered in the upper left corner. I switch to some other pdf viewers, i.e., Adobe Reader, and no black circles are to be found. I wonder if there are some particular improvement to be made.

Thanks for the nice software!
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