Hi Patrik,
We have confirmed the issue “Preservation issue occurs with layers when converting PDF to PDF/A” as a defect in our product and we will include the fix in weekly release on 1st April, 2025.
Please use the below feedback link to track the status of the reported bug.
https://www.syncfusion.com/feedback/66355/preservation-issue-occurs-with-layers-when-converting-pdf-to-pdf-a
Note: If you require a patch for the reported issue in any of our Essential Studio Main or SP release version, then kindly let us know the version, so that we can provide a patch in that version based on our SLA policy.
Disclaimer: “Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization.”
Regards,
Irfana J