Steps to reproduce
Okay, the steps are as follow; add an image to a canvas and then move that image to a folder within the Obsidian Vault. Then rename that folder to something really long. I don’t know the exact length that causes the break but something the length of a short sentence did for me. Then after you rename the folder close and re-open the canvas, the image previews should be broken now.
Did you follow the troubleshooting guide? [Y/N]
Yes! I tested the bug in the sandbox vault mode and it happened in there as well.