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## Problem See https://github.com/neondatabase/neon/issues/11718 and https://neondb.slack.com/archives/C033RQ5SPDH/p1745122797538509 GIST other indexes performing "unlogged build" are using so called fake LSNs - not a real LSN, but something like 0/1. Been stored in lwlsn cache they cause incorrect lookup at PS. ## Summary of changes Do not store fake LSNs in LwLSN hash. Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>