The frame carried key={reloadToken}, so a reload was a NEW element: React
unmounted the old one and the panel went white until the next document arrived.
After a crop change that is not instant — the site is asking av-club for a fresh
ladder — so every framing adjustment flashed an empty panel, which reads as the
preview breaking.
A browser keeps painting the current document while the next is being fetched. So
the element stays and the frame is navigated instead. Same origin through the dev
proxy, which is what makes contentWindow reachable.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
pastilhasandClaude Opus 5
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