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Fixed
The legacy identity path no longer reuses a cached identity for an unidentifiable principal. IdentityAccountBinding.TryCreate now fails closed when the legacy UserId is empty, whitespace, or untrimmed (mirroring the canonical path's guard), so such a principal never becomes a shared key into the process-wide identity IMemoryCache/semaphore and always resolves fresh. This closes a cross-user identity leak where two unidentifiable principals in the same tenant could be served each other's identity.