Why does an invoice look at planned date range instead transaction date range?

Summary:

We are looking into an option to utilize "Date Adjustment Buffer in Days" with "Synchronize task transaction dates with planned dates" . We staged a project for a test that has a plan start date 1/3/2025 and finish date 2/2/2025 with 5 days Date Adjustment Buffer in Days. So we see transaction start date 12/29/2024 and finish date 2/7/2025.When we processed an AP (no PO matching) invoice with 2/6/2025 task expenditure date, it gives me an error message, "The expenditure item date is outside the project dates. Update the project start and finish dates or the expenditure item date of