[pull] canary from vercel:canary#887
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pull[bot] merged 3 commits intocode:canaryfrom Mar 17, 2026
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…91478) See: GHSA-mq59-m269-xvcx and [16.1.7](https://github.com/vercel/next.js/releases/tag/v16.1.7) --------- Co-authored-by: Sebastian "Sebbie" Silbermann <sebastian.silbermann@vercel.com>
Startup loading of APP_PAGE PPR entries seeded the in-memory cache from disk using a size estimate that only counted html and the route-level RSC payload. Empty-shell prerenders have 0-byte html and do not persist a monolithic .rsc file, with the reusable data instead stored in postponed metadata and per-segment .segment.rsc files. That made the computed size 0, caused LRUCache to reject the seeded entry, and forced the first request after next start to rerun prerender and rewrite the build artifacts. Account for postponed state and segment buffers when sizing APP_PAGE cache entries so empty-shell prerenders can warm the startup cache the same way contentful shells do. Add a production regression that asserts both routes are emitted as build artifacts and that next start does not rewrite them on the first request. The regression skips deployment mode because it verifies self-hosted behavior by inspecting local .next artifact mtimes, which is not a portable signal in deployment mode. When deployed through an adapter it is not expected that the local Next.js process is handling entries through the Response cache reading from the `.next` folder anyway
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