I am working on a book and have been practicing layout using APub. The practice document contains reference graphics gather from the web. I pinned them into the text. Along the way I decided to make a different document to try a few things. I copied the text with pinned graphics into a text box in the new document. The images distorted into vertical coloured lines. Next I tried copying the text box containing the text and the pinned graphics. The results were the same. This happens with all the graphics in the document.
MacBook Pro 15 (upgrade RAM, SSD, etc.)
MacOS X 10.15.5
APub 1.8.3