Existing file broke on editor.graphite.art

An artboard I've had for a long time and made many edits to has suddenly broken. The editor suggests I check the node graph to find the errors, and it shows this: <img width="455" height="678" alt="Image" src="https://github.com/user-attachments/assets/b9966431-e55f-4691-ba89-bab2639de206" /> Deleting the "Image" nodes from the graph resolves the errors, but then the source images are gone from my artboard.