Your script has several mistakes. The major one is detection of the offset - there is no "Payload offset" in LUKS2 dump (this string is for LUKS1 dump) - even if you get data segment offset, it is beginning of dm-integrity device metadata area, the real payload follows the dm-integrity metadata
Thus, you are probably rewriting some dm-integrity metadata area (instead of user data) that is never read, so nothing is detected. Milan
