Unmodified annotations should not be reported as modified
For the attached file, Adobe Reader claims that the stamp annotation (Object 129) was modified after the second signature. However it wasn't, that object wasn't included in any further incremental save. IMHO this is a bug in Adobe Reader, apparently related to the fact that the stamp annotation does not contain the (optional) /P entry. (Adding the /P entry solves this). This was reported to the PDFBox team and on stackoverflow in question 74836898.
Media Shark commented
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