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After churning a single L2 region with an fsync per write, close and reopen the image. parse_qcow rebuilds the free list from the on disk refcounts, so a reopen that recovers many clusters means the runtime allocator stranded them. Without the fix the reopen recovered every relocated cluster. Now it finds none. Assisted-by: Claude:Opus-4.8 Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>