This file converts cleanly To Pdf/A-2b (as an example, but others tested) in Aspose.Pdf 26.4 (.NET) but fails in 26.5. veraPdf reports rule 6.2.4.2 PDICCBasedCMYK:
“Overprint mode (OPM) is set To 1 instead of 0 when an …...PDF/A regression in 26.5: OPM=1 retained on ICCBased CMYK with...overprint Aspose.PDF Product Family pdf-to-pdfa markmanley.adlib...