Yes, the release notes for the interim image state that the bug is fixed. If you can prove that it is not fixed I suggest contacting Cisco and present your findings as this would most likely be affecting others as well.
As for solving your issue, upgrading to an ASA 5500X series firewall with version 9.2.1 might be the way to go...
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Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...