We have confirmed the issue "Modified time is not
proper in the comment panel while adding the FreeText annotation
programmatically" and logged it as a defect. The fix for the issue
will be available in our upcoming weekly NuGet release on April 05, 2023.
You can track the status of the issue through the following link.
Feedback link: Modified time is not proper in the
comment panel while adding the FreeText annotation programmatically | Issue
Feedback
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."