Details of your operating system and version of Adobe Illustrator: Windows 10 Insider Build 18312. Illustrator 23.0.1
The steps you were taking when you experienced the issues: When working in Trim View in GPU view, when I add assets from the Libraries panel and move them onto the artboard, my background raster image gets black blocks/rendering issue. If I zoom in and out it goes away until I move the top object again. If I switch to CPU view the issue goes away.

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