wipeSessionListsForGatewaySwitch cleared the persisted transcript-tail
cache but never the in-memory $transcriptTailBySessionId atom. Before this
stack both an ambient local read and an ambient remote read of a recycled
stored id landed under the bare-id key, so the newer backend simply
overwrote the older. Owner-keyed entries coexist instead, and the
unique-match lookup that gates "Show earlier" sees two candidates and
fails closed for that session until eviction. Wipe the atom alongside the
cache.
kshitijk4poor
d15ed44452