Affinity Publisher V2, MacOs Big Sur 11.17.1, iMac Retina 5K 27" 2019, 8core i9 64GB, RadeonProVega 48 8GB
Icons are displayed only fragmented in the Resource Manager window. This is the icon in the Name column and also the image in the Resource Manager preview. All images are linked as picture frames in the document. Also, when I delete and reinsert the images, some are displayed completely, others fragmented.
Here is a screenshot of the resource manager with a fragmented image and a screenshot with a complete image.