The builder loaded the template's own slug — `/collection` — which is not an address, so the frame
showed a 404 while the same arrangement rendered perfectly at /collections/70s in a tab. The page was
fine; the preview was asking for the wrong URL.
It previews an instance now: whichever the server names in `preview_slug`, the first of whatever the
template draws. Which row it is does not matter and deliberately is not a choice — a template IS the
arrangement, and the point of the preview is to see the arrangement with something real in it.
Null when there is nothing to draw yet, which shows as an empty preview rather than a broken one.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
pastilhasandClaude Opus 5
cb6026059a