The count of returned property values is incorrect when running the Update Item operation multiple times.
As shown in the attached screenshot (using PowerShell to retrieve item BOM association properties), I created a minimal assembly containing only one primary part, which has a mirrored instance with the same part number, causing them to be grouped in the vault item BOM.
As you can see, each call showed an increased count of returned properties. Between these calls, I only performed Update Item operations, which should not have increased the count of association properties.
