Old Chrome patches are removed after running the MetaData Import task (PM Import)
Release : 8.5, 8.6
This is working as designed by Google.
When Google releases a new version of Chrome, it also removes the previous update by replacing the existing file with the new version while using the same file name. You can see this in the Altiris Logs when downloading a Chrome bulletin: 'https://dl.google.com/chrome/install/GoogleChromeStandaloneEnterprise.msi'
Please refer to the following document to see what is included with each PM Import: