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During parallel load of a table, Postgres sometimes requests a page from the page server for which no WAL has been generated yet. That's normal; Postgres expects the page to be full of zeros. There was a special case for that in LayeredTimeline::materialize_page, but the problem remained when you're crossing a segment boundary, so that there's no layer for the segment at all. It would be nice to have a more robust cross-check for this case. That might need help from the Postgres side. But this extends the bandaid fix we had in materialize_page() to the case where cross segment boundary. Fixes https://github.com/zenithdb/zenith/issues/841